The Secret Service failed to prevent the assassination attempt against Donald Trump last year at his Pennsylvania campaign rally, according to a Senate committee report, which accuses the agency of a botched operation snarled by communication fumbles and the repeated denial of extra security assets at a time when the former president faced heightened threats on his life. Documents shared by the Senate committee as part of the report also reveal new details about what its Republican chairman characterized as insufficient disciplinary actions against the agents and officers involved.