The U.S. Secret Service is under the microscope for a series of security failures that resulted in former President Donald Trump being shot in the ear during a failed assassination attempt. 

Tasked with protecting federal officials, particularly with providing security for politicians and candidates for office, the agency was caught on the back foot Saturday in Butler, Pennsylvania, when a shooter scaled a building hundreds of feet away from a stage where Trump was standing. Everything from the agency’s protocols in setting up a perimeter to how agents responded to the shooter is now under strict scrutiny.