Following an assassination attempt on former President Donald Trump, Republican senators, including Sen. John Cornyn and Sen. Marsha Blackburn, are demanding the resignation of Secret Service Director Kimberly Cheatle due to perceived security lapses. Cheatle faced intense questioning at the Republican National Convention about allowing Trump to take the stage despite known threats. Local police had informed the Secret Service of insufficient manpower to secure critical areas, enabling shooter Thomas Matthew Crooks to get within striking distance, injuring Trump and others. House Oversight Committee Chair James Comer has issued a subpoena for Cheatle to testify, questioning her competency and the agency's transparency. Homeland Security Secretary Alejandro Mayorkas and the FBI continue to investigate the assassination attempt and the security measures in place.