U.S. Rep. Jacky Rosen, D-Nev., center, during a press conference on the mass shooting at the Las Vegas Metropolitan Police Department headquarters in Las Vegas, Tuesday, Oct. 3, 2017. Erik Verduzc …

U.S. Rep. Jacky Rosen, D-Nev., center, during a press conference on the mass shooting at the Las Vegas Metropolitan Police Department headquarters in Las Vegas, Tuesday, Oct. 3, 2017. Erik Verduzco/Las Vegas Review-Journal