Watch U.S. Secret Service director’s opening remarks in Congressional hearing on Trump shooting

Secret Service spotted Trump rally shooter on roof 20 minutes before gunfire erupted
Students hold pro-Palestinian protest at Columbia University after president's congressional hearing
Secret Service preparing bulletproof glass for Trump rallies
Trump rally shooter used AR-15-style rifle, Secret Service says
Secret service director set to testify in Trump assassination attempt investigation
Secret Service director takes responsibility for security breach at Trump's Pennsylvania rally
Acting Head of the Secret Service blames his agency in Trump's assassination attempt
Acting Secret Service chief “ashamed” of security failures at Trump rally
Congressman to Secret Service director: ‘Biden needs to fire you’ after Trump shooting
GOP Rep. Nancy Mace pushes for impeachment of Secret Service director Kimberly Cheatle