. >>> TONIGHT, THE FALLOUT AFTER THE PRESIDENT SAYS THE U.S. WILL TAKE OVER THE GAZA STRIP. PRESIDENT TRUMP SAYING HE WOULD CONSIDER SENDING IN AMERICAN TROOPS AND THAT THE U.S. WILL OWN THE GAZA STRIP, EVEN SAYING MANY PALESTINIANS WILL HAVE TO RELOCATE TO OTHER COUNTRIES. FLOATING A DIVISION OF THE, QUOTE, RIVIERA, OF THE MIDDLE EAST. NOW, WHITE HOUSE WASN'T COMMITTING TO PUTTING TROOPS ON THE GROUND. KELLY O'DONNELL AND RICHARD ENGEL ACROSS THE MIDDLE EAST. ALL AS THE WHITE HOUSE EYES DEEPER CUTS FOR THE FEDERAL WORK FORCE, INCLUDING AT THE CIA, AN INTELLIGENCE COMMUNITY. THEY CLIP WINGS IN SEATTLE. THE INVESTIGATION TONIGHT. PLUS. [ INAUDIBLE ] >> THE SUSPECT IN CUSTODY, AFTER A 12- HOUR MANHUNT, AFTER A WORKPLACE MASS SHOOTING NEAR OHIO STATE UNIVERSITY. WE'RE ON THE GROUND. AND CAN THOSE WILDLY POPULAR WEIGHT LOSS DRUGS TREAT ADDICTION? STEPHANIE GOSK ON THE CUTTING EDGE OF RESEARCH TODAY. BAD BUNNY'S HITS ARE INSPIRING SO MANY TO GET UP AND DANCE. >> Announcer: THIS IS "NBC NIGHTLY NEWS WITH LESTER HOLT." >> GOOD EVENING. THE QUESTION OF WHETHER THE U.S. COULD REALLY TAKE OWNERSHIP OF THE GAZA STRIP WAS ALMOST SECONDARY TODAY,A THE WORLD FIRST TRIED TO UNDERSTAND EXACTLY WHAT PRESIDENT TRUMP HAS IN MIND. SOUNDING MORE LIKE THE REAL ESTATE MOGUL OF HIS PRIOR LIFE, MR. TRUMP STUNNED LEADERS INSIDE AND OUTSIDE THE MIDDLE EAST LAST NIGHT. WITH THE U.S. TO TAKE OWNERSHIP IN GAZA. IMAGINE A REBUILT VERSION OF THE TERRITORY AS THE RIVIERA OF THE MIDDLE EAST. IT'S A HARD TURN FOR A PRESIDENT WHO CAME TO OFFICE, WARY OF FOREIGN VENTURES. NOW, LEAVING IT ON THE TABLE FOR NOW, AMERICAN BOOTS ON THE GROUND. RELOCATING PALESTINIANS IN POTENTIAL DEFIANCE OF INTERNATIONAL LAW. OVERSEAS AND HERE AT HOME, SHARP REACTION. HIS ALLIES, SECRETING HIM FOR THINKING OUTSIDE THE BOX, WHILE CRITICS CONDEMN THE IDEA. KELLY O'DONNELL BEGINS OUR REPORTER. >> WITH HIS GLOBAL MEGA PHONE. >> THE U.S. WILL TAKE OVER THE GAZA STRIP. >> Reporter: PRESIDENT TRUMP'S PROVOCATIVE AND VOLATILE VISION OF AN AMERICAN TAKEOVER OF WAR-TORN GAZA IS RIVETING. YET TODAY, HE CITED ONLY PRAISE. >> EVERYBODY LOVE ITS. >> Reporter: BUT A RARE SPLIT REACTION FROM THE PRESIDENT'S PARTY. >> WE HAVE TO BACK ISRAEL 100%. SO WHATEVER FORM THAT TAKES, WE'RE INTERESTED IN HAVING THAT DISCUSSION. >> Reporter: WHILE OTHER REPUBLICANS RAISE SERIOUS DOUBTS. >> I'M -- I'M NOT SUPPORTIVE OF HAVING THE AMERICAN PEOPLE PAY TO REBUILD GAZA. I DON'T THINK THAT'S OUR RESPONSIBILITY. >> Reporter: HOWEVER, THE PRESIDENT'S OWN WORDS OUTLINED U.S. CONTROL. >> I WANT TO BE RESPONSIBLE FOR DISMANTLING DANGEROUS BOMBS AND OTHER WEAPONS ON THE SITE. >> Reporter: ALONGSIDE MR. TRUMP DID NOT EXPLAIN HOW HIS PROPOSAL SQUARES WITH HIS FIERCE CRITICISM OF FOREIGN ENTANGLEMENTS AND "AMERICA FIRST" WORLD VIEW. >> WHAT AUTHORITY WOULD ALLOW YOU TO DO THAT? ARE YOU TALKING ABOUT A PERM NENT OCCUPATION THERE? >> I DO SEE A LONG- TERM OWNERSHIP POSITION. AND I SEE IT BRINGING GREAT STABILITY TO THAT PART OF THE MIDDLE EAST AND MAYBE THE ENTIRE MIDDLE EAST. >> Reporter: THE PRESIDENT ALSO SAID HE WOULD SEND U.S. TROOPS "IF NECESSARY." NBC'S GARRETT HAAKE, PRESSING THE WHITE HOUSE TODAY. >> CAN YOU EXPLAIN THIS REVERSAL AND HOW BUILDING AND OWNING SQUARES WITH AMERICA FIRST FOREIGN POLICY. >> I WOULD REJECT THE PREMISE OF YOUR QUESTION THAT THIS FORCES THE UNITED STATES TO BE ENTANGLED IN CONFLICTS ABROAD. THE PRESIDENT HAS NOT COMMITTED TO PUTTING BOOTS ON THE GROUND IN GAZA. HE HAS ALSO SAID THAT THE UNITED STATES IS NOT GOING TO PAY FOR THE REBUILDING OF GAZA. >> PRIME MINISTER NETANYAHU OFFERED PRAISE. >> HE SEES A DIFFERENT FOCUS FOR THAT PIECE OF LAND THAT CAUSES SO MUCH TERRORISM. >> Reporter: THIS WOULD CAUSE EGYPT TO ACCEPT REFUGEE. BUT THEIR CONDEMNNITION WAS SWIFT. INSIDE GAZA TODAY, PALESTINIANS STOOD FIRM. >> HOW I CAN MOVE TO ANOTHER LAND. IT'S MY LAND. >> Reporter: THE PREMISE CHANNELS THE FAMILY BUSINESS. SON-IN-LAW, JARED KUSHNER SPOKE OUT IN MARCH. >> GAZA IS WATERFRONT PROPERTY. IT WOULD BE VERY VALUABLE. IF PEOPLE WOULD FOCUS ON BUILDING UP LIVELIHOODS. >> Reporter: TODAY, DEMOCRATS DEANNOUNCED THE IDEA. >> ABSOLUTELY DUMB, STUPID, AND ILLEGAL. >> KELLY, SECRETARY MARCO RUBIO IS WEIGHING IN, CALLING IT GENEROUS. >> Reporter: HE SAID IT IS NOT A HOSTILE MOVE AND THAT GAZA IS FULL OF UNEXPLODED MUNITIONS, AND THAT MAKES IT UNLIVABLE. HE STRESSED IT WOULD NOT BE PERMANENT. LESTER? >> ALL RIGHT, KELLY O'DONNELL, THANK YOU. RICHARD ENGEL IS STANDING BY. THE WHITE HOUSE SAYS PRESIDENT TRUMP FLOATED THIS IDEA AS A TEMPORARY SOLUTION. WHAT ARE YOU HEARING FROM PEOPLE IN THE REGION? >> Reporter: SO HE MAY HAVE FLOATED IT, BUT IT CRASHED IN THE MIDDLE EAST. I SPOKE TO SEVERAL SENIOR ARAB LEADERS, ASK THEY ALL DESCRIBED IT WITH HORROR AND DISGUST. ONE OFFICIAL ASKING, WHY WAS IT EVEN NECESSARY? WHY WOULD YOU HAVE TO EVEN FORCIBLY REMOVE PALESTINIANS SIMPLY TO DO RECONSTRUCTION? THEY COULD STAY IN ONE PART OF GAZA, WHILE BUILDING TAKES PLAIS IN ANOTHER AREA. ONE OFFICIAL SAID THAT THIS PROPOSED PLAN IS REALLY TANTAMOUNT TO ETHNIC CLEANSING. JORDAN AND EGYPT HAVE PEACE TREATS WITH ISRAEL. HAVE SAID THEY WON'T BE PARTY TO DEPOPULATING THE GAZA STRIP. AND AT THE END OF THE DAY, LESTER, IT BOILS DOWN TO TRUST. PALESTINIANS DON'T BELIEVE THAT IF THEY'RE FORCED OUT, THEY WILL EVER BE ALLOWED TO RETURN. >> Reporter: RICHARD ENGEL, THANK YOU. LET'S TURN TO PRESIDENT TRUMP'S FEDERAL SHAKE UP. WITH ONE BEING PLACED ON LEAVE. AND CIA EMPLOYEES NOW BEING OFFERED A BUYOUT. HERE'S GARRETT HAAKE. >> Reporter: TONIGHT, PRESIDENT TRUMP'S LATEST MOVE IN HIS CAMPAIGN PLEDGE TO SLASH THE SIZE OF THE FEDERAL GOVERNMENT. ALL EMPLOYEES AT THE U.S. AGENCY FOR DEVELOPMENT RECEIVED THIS E-MAIL, SAYING MOST STAFF WILL BE PLACED ON ADMINISTRATIVE LEAVE ON FRIDAY. >> HEY, ELON MUSK HAS TO GO. >> DEMOCRATS PROTESTING. >> WE DON'T PLEDGE ALLEGIANCE TO ELON MUSK. >> WE ARE HERE TO FIGHT BACK. >> YEAH. >> NO ONE ELECTED ELON MUSK TO NOTHING. >> Reporter: WHILE REPUBLICANS DEFENDING MUSK. >> USAID HAS GOT TO ACTUALLY SERVE THE INTERESTS OF AMERICAN FOREIGN POLICY. IT OUGHT TO BE TO PROMOTE THE INTEREST AND WELL BEING OF THE AMERICAN PEOPLE. NOT SOME LEFT-WING AGENDA. >> MUSK POSTING OVERNIGHT, THAT REACTION ARE HOW YOU KNOW DOGE REALLY MATTERS. THIS IS THE ONE SHOT THAT THE AMERICAN PEOPLE HAVE TO DEFEAT BUREAUCRACY. IN ANOTHER COST- CUTTING MOVE, THE TRUMP ADMINISTRATION OFFERING BUYOUTS AT THE CIA AND OTHER INTEL AGENCIES. MORE THAN 40,000 EMPLOYEES SO FAR, HAVE ALREADY ACCEPTED AN EARLY BUYOUT OFFER. >> FROM NOW, WOMEN'S SPORTS WILL BE ONLY FOR WOMEN. [ APPLAUSE ] >> Reporter: AND THIS AFTERNOON, THE PRESIDENT SIGNING A NEW EXECUTIVE ORDER, BANNING TRANSGENDER WOMEN FROM COMPETING IN WOMEN'S SPORTS AND WITHHOLDING FUNDING FROM SCHOOLS THAT DON'T COMPLY. >> WE WILL DEFEND THE PROUD TRADITION OF FEMALE ATHLETES. AND WE WILL NOT ALLOW MEN TO BEAT UP, INJURE, AND CHEAT OUR WOMEN ASK OUR GIRLS. >> THE HUMAN RIGHTS CAMPAIGN RESPONDING, THIS ORDER COULD EXPOSE YOUNG PEOPLE TO HARASSMENT AND DISCRIMINATION. >> Reporter: MEANWHILE, A SECOND FEDERAL JUDGE HAS BLOCKED THE PRESIDENT'S ORDER, ATTEMPTING TO LIMIT BIRTH RIGHT CITIZENSHIP. THE JUDGE TODAY SAID THE ORDER VIOLATES THE 14th AMENDMENT. LESTER? >> GGARRETT HAAKE. THANK YOU. HALLIE JACKSON SPOKE TO SOME ABOUT HOW THEY ARE HANDLING IT. >> Reporter: FROM FURY TO FEAR. >> WILL MY POSITION REMAIN? >> A RANGE OF REACTIONS FROM FEDERAL WORKERS. >> NONE OF THIS IS OKAY. >> Reporter: AS THE PRESIDENT PUSHES TO SCALE BACK THE SIZE OF GOVERNMENT, ACROSS ALL AGENCIES, INCLUDING USAID, WHICH OFFICIALLY TERMINATED CHRISTINA DRYE JUST THIS AFTERNOON. >> IT'S HEARTBREAKING. BECAUSE WE KNOW PEOPLE ARE GOING TO BE LESS HEALTHY, LESS SAFE, THROUGH NO CHOICE OF OUR TEEN. >> WHAT DOES THIS MEAN FOR YOUR LIFE FOR THE SHORTTERM HERE? >> YEAH. I THINK IN 10, 15 DAYS, THIS WHOLE THING HAS BEEN TURNED UPSIDE DOWN. THROUGH NO FAULT OF MY OWN. I DON'T KNOW WHERE MY RENT IS COMING FROM. >> Reporter: NEARLY 3 MILLION CIVILIANS WORK FOR THE FEDERAL GOVERNMENT. 80% LIVE OUTSIDE OF THE WASHINGTON AREA. >> IT HAS BEEN CHAOS. >> Reporter: AFTER 10 YEARS IN THE NAVY, ANDREA GALBREATH SHIFTED TO A CAREER IN THE FEDERAL GOVERNMENT, AT LEAST FOR NOW. >> NOBODY WANTS TO WORK IN THIS TYPE OF CONDITION, WHERE WE'RE GOING TO BE IN A PSYCHOLOGICAL WARFARE, FOR HOW LONG? >> Reporter: OTHER FEDERAL WORKERS, NOT REVEALING THEIR NAMES, FOR FEAR OF RETRIBUTION, DESCRIBE FEAR AND PANIC. AN ORWELLIAN NIGHTMARE. >> I DID NOT VOTE FOR HIM. AND I HAVE A HUGE AMOUNT OF ISSUE WITH THE ACCESS THAT HE'S GETTING. >> Reporter: VICE PRESIDENT VANCE TODAY, ARGUING MANY AMERICANS DID VOTE FOR DONALD TRUMP, WHO PROMISED REPEATEDLY TO HAVE ELON MUSK ROOT OUT WASTEFUL SPENDING IN OUR GOVERNMENT. AND THE WHITE HOUSE HAS SAID A BLOATED FEDERAL BUREAUCRACY HAS COST HUNDREDS OF BILLIONS EACH YEAR. DRYE SAYS SHE UNDERSTANDS STREAMLINING. BUT -- >> THERE HAS TO BE A MECHANISM, YOU KNOW, BY WHICH THAT OCCURS, THAT OFFERS BASIC DECENCY AND RESPECT TO THAT WORKER. >> Reporter: THE POLITICAL GETTING PERSONAL. HALLIE JACKSON, WASHINGTON. >>> YET ANOTHER AVIATION INCIDENT IN SEATTLE. WHERE A TAXIING PLANE STRUCK ANOTHER JET. THE TRANSPORTATION SECRETARY ANNOUNCED CHANGES. >> Reporter: THE FAA AND NTSB ARE INVESTIGATING WHAT HAPPENED ON SEATTLE'S SEATAC AIRPORT. THE WING OF A 787, SLICED INTO THE TAIL OF A DELTA 7 37, WAITING TO BE DEICED. AND ONE WEEK AFTER THAT FATAL CRASH, AT REAGAN INTERNATIONAL AIRPORT. THE FAA SAID IT WILL NO LONGER ALLOW CIVILIAN AIRCRAFT TO SHARE THE SAME SPACE AT THE SAME TIME, AROUND REAGAN INTERNATIONAL AIRPORT. SEAN DUFFY SAYS THE NUMBER OF MILITARY HELICOPTERS FLYING AROUND D.C. WILL HAVE TO BE REDUCED. >> IF WE HAVE GENERALS WHO ARE FLYING IN HELICOPTERS, FOR CONVENIENCE, THROUGH THIS AIR SPACE, THAT'S UNACCEPTABLE. GET IN A DAMN SUBURBAN AND DRIVE. YOU DON'T NEED TO TAKE A HELICOPTER. >> YEAH, DUFFY SAID THE ADMINISTRATION IS WORKING TO STAFF UP AIR TRAFFIC CONTROL FACILITIES. AND ELON MUSK SAYS HAS DOGE TEAM WILL MAKE RAPID SAFETY UPGRADES TO THE AIR TRAFFIC CONTROL SYSTEM, HIS WORDS. LESTER? >> ALL RIGHT, TOM. THANKS. >>> A SUSPECT IS UNDER ARREST TONIGHT ON A CHARGE OF AGGRAVATED MURDER, AFTER A MASS SHOOTING AT A WAREHOUSE IN NOW ALBANY, OHIO. MAGGIE WESKE REPORTS. >> Reporter: TONIGHT, A 12-HOUR MANHUNT FOR REGINALD FOSTER III, THE EMPLOYEE WHO INN LEASHED A DEADLY ATTACK, INSIDE THIS ATTACK. ENDING WITH DRAMATIC ARREST. [ INAUDIBLE ] >> Reporter: NEWLY- RELEASED 911 CALLS, APPEARING TO BE FROM VICTIMS, DETAILING THE HORROR. >> I'VE BEEN SHOT ON MY NECK. AND MY BUDDY IS ON THE FLOOR. BUT I TOOK THE GUN AWAY. >> MY BUDDY IS SHOT ON THE FLOOR. HE'S DOWN ON THE FLOOR. >> OKAY. IS HE BREATHING? >> I DON'T KNOW. I'VE BEEN SHOT. [ INAUDIBLE ] I CAN'T BREATHE. >> OKAY. >> FIVE PEOPLE WERE HURT. ONE KILLED. AUTHORITIES NOT RELEASING NAMES AND CONFIRMING THEY RECOVERED A HANDGUN AT THE SCENE. THEY SAY FOSTER WAS ON SHIFT FOR HOURS BEFORE OPENING FIRE AROUND 10:30 LAST NIGHT. HIS MOTIVE, STILL UNCLEAR. >> DO YOU THINK HE TARGETED THOSE SIX PEOPLE? OR DO YOU THINK THEY WERE JUST AROUND? >> I THINK WE'RE BEGINNING TO GET A PICTURE OF THAT. WE NEED TO FIND OUT WHERE IS HIS WORK STATION COMPARED TO THE OTHERS. >> INVESTIGATOR SAYS FOSTER FLED USING A RIDE SHARE SERVICE. AGENTS TRACKING HIM DOWN MORE THAN 20 MILES AWAY, NEAR OHIO STATE UNIVERSITY'S CAMPUS. >> Reporter: COURT DOCUMENTS SAY FOSTER, WITH A $20 MILLION BOND. >> MAGGIE VESPA, THANK YOU. >>> THAT BLING RING. >>> WE'RE BACK WITH NEWS DETAILS ON THE INTERNATIONAL CRIME RING BUST FROM OHIO TO DIAMOND DISTRICT OF MANHATTAN TO CHILE. IT COMES AS INVESTIGATORS REVEALED NEW INFORMATION ABOUT WHAT THEY FOUND WHEN THEY WERE UNDER COVER. LAURA JARRETT HAS MORE. >> Reporter: NEW DETAILS EMERGING IN COURT TODAY, ON TWO SUSPECTS, FEDERAL PROSECUTORS HAD ON DEMAND. STOLEN LUXURY GOODS. WORKING WITH THIS INTERNATIONAL CRIME RING. TARGETING HOMES OF PRO ATHLETES. THIS PAWN SHOP IN DIAMOND DISTRICT RAIDED BY THE FBI TUESDAY, WHERE AUTHORITIES SAY THEY RECOVERED DOZENS OF STOLEN, HIGH-END WATCHES AND JEWELRY. AFTER AN UNDERCOVER AGENT SPENT MONTHS, SELLING THEM STOLEN GOODS FOR CASH. PROSECUTORS SAY PHONE RECORDS AND SURVEILLANCE LINK DEMETRI TO THEFT RINGS. NOVINSKI, TYPICALLY TIED TO A GROUP, ALLEGEDLY BEHIND THE BURGLARY OF CINCINNATI BENGALS QUARTERBACK, JOE BURROW. ACCORDING TO THREE SOURCES FAMILIAR WITH THE MATTER. TONIGHT, RELEASING THIS GROUP, AS A FEDERAL GRAND JURY IN OHIO INDICTED THREE OF THE MEN. AFTER STATE PATROL OFFICERS FOUND THIS LSU T-SHIRT AND OTHER ITEMS IN THE CAR. >> WHERE ARE YOU GOING NOW? >> BACK IN NEW YORK, BOTH DEFENDANTS PLEADING NOT GUILTY TODAY. >> WE'VE HEARD PROSECUTORS SAY MANY THINGS BUT I'M ANXIOUS TO SEE THE EVIDENCE. >> Reporter: PROSECUTORS SAY THEY'RE A FLIGHT RISK. AS RASH OF THEFTS >>> BACK NOW WITH >>> BACK NOW ABOUT A STUDY OF A POTENTIAL MEDICAL BREAKTHROUGH. RESEARCHERS EXPLORING IF THOSE WILDLY POPULAR WEIGHT LOSS DRUGS CAN TREAT ADDICTION. STEPHANIE GOSK. >> THE NEW CLASS OF WEIGHT LOSS DRUGS, CALLED GLP-1s ARE RADICALLY CHANGING PEOPLE'S LIVES. BUT SOME PATIENTS ARE NOTICING MORE THAN THE POUNDS COMING OFF. >> ANYONE ELSE KICK THE WHINE WINE HABIT? >> IT'S WHAT HELPED ME GET SOBER. >> Reporter: CAN THESE BE A POWERFUL TOOL IN THE FIGHT AGAINST ADDICTION. EARLY STUDIES AND ANIMAL RESEARCH HAVE SHOWN SOME PROMISE. >> WHAT WE'RE REALLY MISSING AT THIS POINT AND IT'S CRITICAL, IS TO HAVE THOSE PLACEBO CONTROLLED RANDOMIZED CLINICAL TRIALS. >> AND THOOTDZ WHAT YOU'RE DOING? THAT THE WHAT WE'RE DOING. >> STUDY. >> THE HOPE IS THAT BY MEASURING EVERYTHING FROM BEHAVIOR DOWN TO GENES, WE MAY BE ABLE TO GET A BETTER PICTURE OF WHY THESE MEDICATIONS ARE WORKING, IF THEY ARE WORKING. >> Reporter: CARA STAINBROOK STARTED TAKING GLP-1 TO LOSE WEIGHT A YEAR AND A HALF AGO. >> MY VERY FIRST SHOT. I NO LONGER WANTED FOOD. >> BUT THE SELF- DESCRIBED DAILY DRINKER STOPPED DRINKING. >> I DIDN'T PICK UP THE BOTTLE. AND YOU WERE PICKING UP THE BOTTLE EVERY DAY? >> YES. >> STAINBROOK IS NOT PART OF THE STUDY. >> HOW LONG HAS THAT BOTTLE BEEN IN THAT CABINET? >> 19 MONTHS. >> Reporter: BUT HER EXPERIENCE IS EXACTLY WHAT RESEARCHERS AT OSU WANT TO UNDERSTAND. STUDY PARTICIPANTS LOOK AT PICTURES OF DRINKS WITH AND WITHOUT ALCOHOL. >> WE ARE TRYING TO LOOK AT HOW THEIR BRAINS RESPOND TO THESE DIFFERENT KINDS OF CUES. >> IT WAS WITH INFRARED. >> I WANT YOU TO TRY AS QUICKLY AS YOU CAN. >> Reporter: THE HOPE IS THAT GLP-1 WOULD HAVE THE SAME BRAIN ACTIVITY, REGARDLESS OF THE DRINK THEY SEE. >> WE KNOW THIS IS A PERSON WHO MEETS THE CRITERIA FOR ALCOHOL USE DISORDER. >> Reporter: IF THE DRUG WORKS, THOSE BRAIN REGIONS MAZE NO LONGER LIGHT UP. >> IT WOULD LOOK LIKE THIS. >> NOTHING. >> RIGHT. >> Reporter: THE RESEARCHERS ALSO MONITOR CHANGES IN FOOD, USING VIRTUAL REALITY. >> THEY HAD TO GIVE ME ANOTHER PLATE BECAUSE I'VE TAKEN SO MUCH FOOD AT THIS POINT UPON. >> Reporter: THE STUDY WRAPPING UP LATER THIS YEAR, PROMISING A CLEARER PICTURE OF WHAT THESE DRUGS CAN DO. >> IT IS VERY CLEAR AT THIS POINT, THAT WE ARE SORT OF AT THE BEGINNING OF A REVOLUTION IN MEDICINE. THE QUESTION IS, ARE WE AT A BEGINNING OF A REVOLUTION IN ADDICTION MEDICINE? >> Reporter: STEPHANIE GOSK, NBC NEWS, TULSA, OKLAHOMA. >> WHEN WE COME BACK, THE GOOD NEWS ABOUT BA >>> FINALLY, THERE'S GOOD NEWS TONIGHT ABOUT THE POWER OF MUSIC TO BRING ALL OF US TOGETHER AND GET OUT ON THE FLOOR, INCLUDING OUR ANTONIA HILTON. >> Reporter: AN EARLY JANUARY, BROOKLYN'S SALSA INSTRUCTOR, WILL NIEVES, NOTICED A LOT OF STUDENTS PACKING INTO HIS SALSA 101 CLASSES. TURNS OUT, MANY WERE INSPIRED BY ONE MAN, BAD BUNNY. >> WHEN YOU COMPARE YOUR BEGINNER CLASSES, PREALBUM DROPPING, POST ALBUM DROPPING, WHAT'S IT LOOK LIKE? >> BIG DIFFERENCE. WE WERE ALWAYS BUSY, 30 TO 40. BUT SOME OF THESE NEW CLASSES ARE 60 TO 70. >> FOR YEARS, BAD BUNNY, WHOSE REAL NAME IS BENITO ANTONIO MARTINEZ OCASIO, HAS BEEN AT THE TOP OF HIS GAME. POPULARIZING SPANISH AND HIP-HOP GLOBALLY. BUT HIS LATEST ALBUM EXPLORES GENRES LIKE SALSA. INSPIRING TIKTOK DANCE CHALLENGES. AND BRINGING GENERATIONS TOGETHER. WILL SHOWED ME THE BASICS OF THE PUERTO RICAN VARIATION ON SALSA. ONE SONG HAS REALLY STRUCK A CORD. [ SPEAKING IN A GLOBAL LANGUAGE ]$ >> WHEN THIS MUSIC PLAYS ON THE SPEAKERS. WHAT DO YOU SEE HAPPENING IN THE ROOM? >> OH, MY GOD. I HEAR CLAPPING, CHEERING. >> CHANNELS ALL SORTS OF EMOTIONS IN ME, FROM SADNESS TO HAPPINESS. >> Reporter: WILL SAYS AFTER EVERYTHING HIS ISLAND HAS BEEN THROUGH, FROM HURRICANE MARIA TO PROTESTS, HE BELIEVES BAD BUNNY IS SENDING A MESSAGE. >> I THINK HE'S SAYING THAT PUERTO RICO IS HERE. AND THAT PIQUE IS NOT DYING. WE'RE GOING TO REBUILD AND GROW EVEN BIGGER. >> Reporter: HE JUST HOPES EVERYONE CONTINUES TO LISTEN AND DANCE. ANTONIA HILTON. >> LOVE THAT, UNABASHED JOY. THAT IS "NIGHTLY