WASHINGTON, DC - OCTOBER 02:  U.S. President Donald Trump and first lady Melania Trump lead a moment of silence for the victims of the Las Vegas shooting October 2, 2017 at the South Lawn of the White House in Washington, DC. A lone gunman opened fire from a hotel room above in Las Vegas to an outdoor country music festival killing at least 58 people in the worst mass shooting in modern American history.  (Photo by Alex Wong/Getty Images)