Watch Live: Secret Service Director Kimberly Cheatle testifies about Trump shooting

Washington — Secret Service Director Kimberly Cheatle is testifying Monday before the House Oversight and Accountability Committee about the security failures that allowed a 20-year-old gunman to open fire on former President Donald Trump and a crowd of his supporters at a rally more than a week ago.

Cheatle has come under significant pressure to resign in the aftermath of the assassination attempt, in which Trump and two others were injured and one rally attendee was killed. 

The FBI identified Thomas Matthew Crooks as the shooter, and he was killed by a Secret Service sniper. Lawmakers have questioned how Crooks was able to gain access to a rooftop so close to where Trump was speaking at the campaign event in Butler, Pennsylvania.