Las Vegas

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Meghan Trainor poses in the press room with the awards for top hot 100 song for “All About That Bass” and top digital song for “All About That Bass” at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Eric Jamison/Invision/AP) ** FILE **

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Taylor Swift accepts the award for top artist at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 17, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)

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Dr. Ben Carson pauses for a moment while speaking at Opportunity Village, in Las Vegas, on Wednesday, May 13, 2015. (Associated Press) ** FILE **

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Former Florida Gov. Jeb Bush speaks at a Clark County Republican Party dinner Wednesday, May 13, 2015, in Las Vegas. (AP Photo/John Locher)

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This May 23, 2011 file photo shows, former Nevada Sen. John Lee, D-North Las Vegas, at work on the Senate floor at the Legislature in Carson City, Nev. Lee was elected mayor of the state’s fourth-largest city in 2013. North Las Vegas police are asking the FBI to reopen an investigation of how Mayor Lee obtained images that he suspected were child pornography on his computer. (AP Photo/Cathleen Allison, File)

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This May 2, 2015, file photo shows Floyd Mayweather Jr. gesturing during a press conference following his welterweight title fight in Las Vegas. Mayweather said in an upcoming interview with Showtime that at this moment he's not interested in a rematch with Manny Pacquiao "because he's a sore loser and he's a coward." (AP Photo/John Locher, File)

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A drone flies at the International Consumer Electronics Show in Las Vegas, Jan. 8, 2014. (Associated Press) ** FILE **

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Recording artist Mariah Carey performs at The Colosseum at Caesars Palace, Wednesday, May 6, 2015, in Las Vegas. (Photo by Eric Jamison/Invision/AP)

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FILE - In this Sept. 10, 2010, file photo, boxer Floyd Mayweather Jr., center, escorted by unidentified friends, exits the Clark County Detention Center after posting bail on a grand larceny charge stemming from a domestic violence complaint, in Las Vegas. The mother of three of Floyd Mayweather’s children has sued the undefeated champion for defamation over his recent comments about a 2010 domestic violence incident in Las Vegas. Josie Harris filed the lawsuit Tuesday, May 5, 2015, in Los Angeles, days after Mayweather defeated Manny Pacquiao in a highly anticipated bout. (AP Photo/Isaac Brekken, File)

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Speaking in Las Vegas at a Cinco de Mayo meeting focused on immigration, Hillary Rodham Clinton met with so-called Dreamers, or young illegal immigrants here under color of President Obama's initial 2012 amnesty, and said she will protect them from Republicans who she said are intent on deporting them. (Associated Press)

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In this May 2, 2015, file photo, actor Jamie Foxx sings the national anthem before the start of the world welterweight championship bout between Floyd Mayweather Jr. and Manny Pacquiao in Las Vegas. (AP Photo/Isaac Brekken, File)

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FILE - In this Monday, April 27, 2015, file photo, Mariah Carey poses for a photo at her Official Welcome to Caesars Palace in Las Vegas. Billboard and Dick Clark Productions announced Tuesday, May 5, 2015, that Carey will perform on this year’s awards show. The 2015 Billboard Music Awards will be broadcast live from the MGM Grand Garden Arena in Las Vegas on Sunday, May 17. (Photo by Andrew Estey/Invision/AP, File)

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Floyd Mayweather Jr., left, holds up the title belt next to referee Kenny Bayless after his win against Manny Pacquiao, from the Philippines, in their welterweight title fight on Saturday, May 2, 2015 in Las Vegas. (AP Photo/John Locher)

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Fans cheer before the Floyd Mayweather Jr. and Manny Pacquiao weigh-in on Friday, May 1, 2015 in Las Vegas. The world weltherweight title fight between Mayweather Jr. and Pacquiao is scheduled for May 2. (AP Photo/John Locher)

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Floyd Mayweather Sr., from left, Floyd Mayweather Jr., Manny Pacquiao and Freddie Roach pose for photographers during a news conference Wednesday, April 29, 2015, in Las Vegas. Mayweather Jr. will face Pacquiao in a welterweight boxing match in Las Vegas on May 2. (AP Photo/John Locher)

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Boxers Floyd Mayweather Jr., left, and Manny Pacquiao pose with a WBC belt during a press conference Wednesday, April 29, 2015, in Las Vegas. Mayweather will face Pacquiao in a welterweight title fight in Las Vegas on May 2. At right is Freddie Roach, Pacquiao's trainer. (AP Photo/John Locher)

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Michael B. Jordan, left, Kate Mara, center, and Jamie Bell, cast members in the upcoming film "Fantastic Four" pose together for a selfie during the 2015 Pioneer of the Year dinner honoring 20th Century Fox Film Chairman and CEO Jim Gianopulos, during CinemaCon 2015 at Caesars Palace on Wednesday, April 22, 2015, in Las Vegas. (Photo by Chris Pizzello/Invision/AP)