Sen. Mark Warner, the chief Democratic lawmaker on the Senate Intelligence Committee, sketched out his concerns Thursday over efforts by President Trump's supporters to undermine the investigation into Russian interference by Special Counsel Robert Mueller.

"Mike, I'm not suggesting anything other than the fact that the tone and tenor of the comments coming out of the president's allies both elected and otherwise should send a chill through all of us." — Warner to Axios' Mike Allen

Go deeper: Warner voiced his concerns during a Wednesday speech on the floor of the Senate.