Kimberly Cheatle has resigned as the director of the U.S. Secret Service following intense criticism over the agency's failure to prevent an assassination attempt on former President Donald Trump at a Pennsylvania rally. Ronald Rowe Jr. has been appointed as the acting director. The attempt resulted in Trump being grazed by a bullet, the death of a former fire chief, and injuries to two others. Lawmakers from both parties, as well as President Joe Biden, have called for thorough investigations into the security lapses. Cheatle, who took full responsibility for the failures, faced bipartisan grilling during a House Oversight Committee hearing. Her resignation marks a historical first for a Secret Service director stepping down immediately after an assassination attempt on a president or candidate.