U.S. President Donald Trump, left, and U.S. First Lady Melania Trump greet children dressed up in costumes during a Halloween event on the South Lawn of the White House in Washington, D.C., U.S., on Monday, Oct. 30, 2017. Trump greeted costumed children during a traditional Halloween trick-or-treat at the White House, on the same day as Special Counsel Robert Mueller's investigation took a major turn as authorities charged three people -- a former campaign chief, his business associate and an ex-policy adviser -- with crimes including money laundering, lying to the FBI and conspiracy. Photographer: Andrew Harrer/Bloomberg via Getty Images
