Secret Service Director Kimberly Cheatle is set to tell House lawmakers Monday that her agency “failed” when it came to security at the Trump rally in Pennsylvania, where an assassination attempt unfolded.

“The Secret Service’s solemn mission is to protect our nation’s leaders. On July 13th, we failed,” Cheatle is expected to say, according to excerpts of her remarks released by the Department of Homeland Security. “As the Director of the United States Secret Service, I take full responsibility for any security lapse. As an agency, we are fully cooperating with the FBI’s investigation, the oversight you have initiated here, and conducting our own internal mission assurance review at my direction.”

“We must learn what happened and I will move heaven and earth to ensure an incident like July 13 does not happen again,” Cheatle is also expected to say. “Thinking about what we should have done differently is never far from my thoughts.”