The US Secret Service is under mounting pressure to explain the failings that led to the attempted assassination of Donald Trump.
Republicans are calling for the agency's director, Kimberly Cheatle, to resign, saying she has not provided enough information about how a gunman was able to get so close to the former president.
James Comer, the Republican leader of the House oversight and accountability committee, issued a subpoena on Wednesday compelling Ms Cheatle to give evidence in front of the panel on Monday.
The “lack of transparency and failure to co-operate” with the committee called into question Ms Cheatle's ability to lead the Secret Service and made the subpoena necessary, Mr Comer said.
“The assassination attempt of the former president and current Republican nominee for president represents a total failure of the agency's core mission and demands congressional oversight,” he wrote to Ms Cheatle.
Initial reviews of Saturday's attack, when Thomas Crooks, 20, opened fire from a rooftop with a clear line of sight to Mr Trump, have pointed to a failure of local and federal law enforcement agencies to communicate properly during the rally.
Mr Crooks was able to get within 135 metres of the stage where the Republican candidate was speaking.
That happened despite a threat on Mr Trump’s life from Iran, leading to extra security in the days before the rally.
Conspiracy theories are already swirling online, suggesting the Secret Service knowingly failed to take action against Mr Crooks even though he was seen on the roof minutes before the shooting.
“Now you have the blame game, people pointing fingers,” Mark Esper, former defence secretary under Mr Trump, said at the Aspen Security Forum.
“Is it local or state versus federal? Who did this? Who did that? You have folks on the right who, each side, have conspiracy theories about what happened, what didn't happen.”
House Speaker Mike Johnson, meanwhile, announced he would set up a task force to investigate security failures that occurred during the assassination attempt.
Mr Johnson, a Republican, said he would be calling on Ms Cheatle to resign, telling Fox News: “I think she’s shown what her priorities are.”
He said the task force would be made up of Republicans and Democrats, and its formation would speed up the investigation into the shooting.
“We must have accountability for this. It was inexcusable,” Mr Johnson said. “Obviously, there were security lapses. You don’t have to be a special ops expert to understand that. And we’re going to get down to the bottom of it quickly.”
Ms Cheatle said her agency was working to understand how Saturday’s shooting happened and to make sure there are no such attacks in future. She has said she will not resign.
Matthew Noyes, cyber policy director and strategy director of the Secret Service, said the agency was struggling with low funding.
Also speaking in Aspen, Mr Noyes said it had “long been the case” that the Secret Service had been constrained by limits on its budget.
Adding to those stresses, President Joe Biden has ordered the Secret Service to begin providing protection to third-party candidate Robert F Kennedy Jr. Mr Trump's running mate, JD Vance, also has been assigned a security deal.
Presidential candidates Cornel West and Jill Stein are also seeking Secret Service protection.
“We definitely believe we should have those protections in this political climate,” Dr Stein's representative, Jason Call, told The National.
Trump shooting – in pictures
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Republican presidential candidate and former president Donald Trump gestures as he is surrounded by US Secret Service agents and helped off stage at a campaign rally. AP Photo -
Police snipers return fire after shots were fired while Trump was speaking at a campaign event in Butler. AP Photo -
Members of the crowd react as US Secret Service agents surround Trump at the campaign event in Butler. AP Photo -
Trump is helped off stage by US Secret Service agents at a campaign rally in Butler. AP Photo -
Trump supporters laying in the stands after shots were fired at the campaign event. AFP -
People scatter after gunfire rang out during the campaign rally in Pennsylvania. AFP -
Trump is rushed off stage after an incident during a campaign rally at the Butler Farm Show Inc. in Butler, Pennsylvania. EPA -
Blood is seen in the stands after shots were fired at Trump's campaign event at Butler Farm Show Inc. in Butler, Pennsylvania. AFP -
Trump reacts as shots ring out during a campaign rally in Butler, Pennsylvania. Reuters -
Secret Service agents dive to cover Trump after shots were heard. AP -
Trump is covered by Secret Service agents on stage. AP -
Trump is rushed off stage. EPA -
Trump is shown covered by Secret Service agents. AFP -
Blood can be seen on Trump's head after shots were heard. AFP -
Trump is taken away from rally. ABC/ US Network Pool / Reuters -
Supporters look on as Trump is rushed off stage. EPA -
Trump is pushed into a vehicle by Secret Service agents. AP -
A person is removed by state police from the stands after the shooting. AFP -
Secret Service agents surround the stage. AP -
Secret Service agents patrol after the incident. Reuters -
A Secret Service agent gives directions at the Trump rally. Getty Images / AFP -
The stage after the shooting. Reuters -
People watch the Trump rally on TV. AP -
A monitor displays news from Trump's rally. Bloomberg -
Trump gestures he leaves the stage at the campaign rally. AP Photo
