WASHINGTON, D.C. — The bipartisan House task force charged with investigating the July attempted assassination of former President Donald Trump held its first public hearing Sept. 26.

The hearing came one day after the Senate Homeland Security Committee released a report detailing key failures by the Secret Service that led to lapses in security measures on July 13, when Trump was shot at a rally in Butler, Pennsylvania. That report follows the publication of an internal review from the Secret Service itself that acknowledged multiple errors.

The Thursday hearing focused on the role local law enforcement played in securing the Butler rally, though lawmakers dug in on failures by both local agencies and the Secret Service.

“It was not a single mistake that allowed crooks to outmaneuver one of our country's most elite, elite group of security professionals. There were security failures on multiple fronts,” said Rep. Mike Kelly, R-Pa., who chairs the task force.

On July 13, a bullet grazed Trump’s ear and a man attending the rally was killed before a Secret Service sniper killed the gunman, Thomas M. Crooks.

The task force said it had identified three main failures: not enough planning, not closing the building Crooks used to shoot Trump, and no common communication method between agencies.

The Secret Service initially blamed local officers for allowing the shooting to happen, but the agency has since taken full accountability for security failures.

“The Secret Service needs to shift how we do business,” testified former Secret Service agent Patrick Sullivan.

The task force’s conclusions so far mirror the conclusions of the separate investigations by the Senate and Secret Service.

The task force next plans to focus on the specific role the Secret Service played in decisions that day, as well as expand the scope of its investigation to cover the assassination attempt of Trump on Sept. 14 in West Palm Beach, Florida.

The task force plans to release its findings by Dec. 13.

With presidential candidates campaigning in locations across the country, both lawmakers and law enforcement agreed time was of the essence to determine what went wrong and to prevent it from happening again.

Trump plans to hold a second rally in Butler on Oct. 5.