Senators Ron Wyden (D-Ore.), Sheldon Whitehouse (D-R.I.), Jack Reed (D-R.I.), Tom Carper (D-Del.), Tom Udall (D-N.M.), Kirsten Gillibrand (D-N.Y.), Richard Blumenthal (D-Conn.), and Chris Van Hollen (D-Md.) letters to President Donald Trump and the Secret Service, March 6, 2017.