By Ryan Patrick Jones

(Reuters) -A U.S. Senate report released on Sunday said a “cascade” of failures allowed a gunman to shoot at Donald Trump during a campaign rally last year and faulted Secret Service discipline including the lack of firings in the wake of the attack.

The report, released a year after a 20-year-old gunman opened fire on Trump in Butler, Pennsylvania, grazing his ear, accused the Secret Service of a pattern of negligence and communications breakdowns in planning and execution of the rally.

“This was not a single error. It was a cascade of preventable failures that nearly cost President Trump his life,” the Senate Homeland Security and Governmental Affairs Committee report said. The Secret Service is charged with protecting current and former presidents and their families, as well visiting foreign leaders and some other senior officials.

One attendee of the July 13, 2014, rally was killed and two others were injured in the shooting. The gunman, Thomas Matthew Crooks, was subsequently shot to death by Secret Service agents.

“This was not a single lapse in judgment. It was a complete breakdown of security at every level — fueled by bureaucratic indifference, a lack of clear protocols, and a shocking refusal to act on direct threats,” the committee’s Republican chairman, Senator Rand Paul of Kentucky, said in a statement.

Kimberly Cheatle resigned as the director of the Secret Service 10 days after the shooting, amid harsh scrutiny of the agency’s role, and six Secret Service agents on duty during the attempt received suspensions ranging from 10 to 42 days, the agency said on Thursday.

The committee said more than six officials should have been punished, and that two of those who were disciplined received lighter punishments than it had recommended. It highlighted the fact that no one was fired.

Current Secret Service Director Sean Curran said in a statement that the agency has received the report and will continue to cooperate with the committee.

“Following the events of July 13, the Secret Service took a serious look at our operations and implemented substantive reforms to address the failures that occurred that day,” Curran said.

(Reporting by Ryan Patrick Jones in Toronto; Editing by Scott Malone and Chizu Nomiyama )