Kimberly A. Cheatle, who resigned after Donald J. Trump was grazed by a bullet as a candidate a year ago, pushed back against findings in a Senate report released on Sunday.

One attendee was killed, two others wounded and a bullet grazed Trump’s ear before a Secret Service counter sniper opened fire on Crooks and killed him. That day jolted an already chaotic race for the White House and solidified Trump’s iconic status in his party and beyond.