WASHINGTON (AP) — The Republican chairman of the House Oversight and Accountability Committee issued a subpoena Wednesday to the Secret Service director compelling her to appear before the committee on Monday for what is scheduled to be the first congressional hearing into the attempted assassination of former President Donald Trump.

And even before the first hearing Republican calls for Director Kimberly Cheatle to resign intensified Wednesday with top Republican leaders from both the House and the Senate saying she should step down. The director has said she has no intention of resigning.

Rep. James Comer said initially that the Secret Service committed to her attendance but that Homeland Security officials appeared to intervene and there has been no "meaningful updates or information" shared with the committee.

Comer said the "lack of transparency and failure to cooperate" with the committee called into question Cheatle's ability to lead the Secret Service and necessitated the subpoena.

Cheatle has said the agency understands the importance of a review ordered by Democratic President Joe Biden and would fully participate in it as well as with congressional committees looking into the shooting.

In response to the subpoena and an earlier letter from Comer, Zephranie Buetow, an assistant secretary at Homeland Security, said that while the department was "disappointed that the Committee rushed to issue a subpoena," Cheatle welcomes the chance to testify. The official said that given Cheatle's focus on securing the ongoing Republican National Convention, the department would appreciate if she could appear on July 25 or July 26, or the following week, instead of Monday.

The Oversight panel rejected that request for a change of date and committee spokesperson Jessica Collins said, "Director Cheatle has agreed to comply with Chairman Comer's subpoena and the hearing will take place as scheduled."

"Americans demand and deserve answers from the director about the attempted assassination of President Trump and the Secret Service's egregious failures," Collins said.

The subpoena was just one of a series of developments that occurred Wednesday in the wake of the Saturday assassination attempt.

The fact that a shooter was able to get so close to the former president while he's supposed to be closely guarded has raised questions about what security plans the agency tasked with taking a bullet for its protectees put in place and who is ultimately responsible for allowing the 20-year-old gunman to climb a roof where he had a clear line of sight to a former president.

House Speaker Mike Johnson announced he would be setting up a task force to investigate security failures that occurred during the assassination attempt. He also said he would be calling on Cheatle to resign from her post as director of the Secret Service, saying on Fox News Channel without elaborating, "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 investigative process.

"We must have accountability for this. It was inexcusable," 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."

Sen. Mitch McConnell, the Republican leader in the Senate, added his name to the list of lawmakers calling for Cheatle to step down. He said on the social media platform X that the near assassination was a "grave attack on American democracy."

"The nation deserves answers and accountability," McConnell tweeted. New leadership at the Secret Service would be an important step in that direction."

The House Homeland Security Committee also invited several state and local law enforcement officials from Pennsylvania to testify at a hearing in the coming days with Rep. Mark Green, the committee's chairman, saying their accounts of events were critical to the investigation.

A key issue in the unfolding aftermath of the shooting is how security responsibilities were divided between Secret Service and local law enforcement at the rally and what breakdowns occurred that eventually allowed the gunman onto the roof.

Cheatle said during an interview Monday with ABC News that the shooting should never have happened, but also said she has no plans to resign.

When asked who bears the most responsibility for the shooting happening, she said: "What I would say is the Secret Service is responsible for the protection of the former president."

"The buck stops with me. I am the director of the Secret Service," she said.

Anthony Guglielmi, a spokesman for the U.S. Secret Service, on Wednesday said: "Director Kimberly Cheatle is proud to work alongside the dedicated men and women of the U.S. Secret Service and has no intention to resign."

So far, she has the support of the administration.

"I have 100% confidence in the director of the United States Secret Service. I have 100% confidence in the United States Secret Service," Homeland Security Secretary Alejandro Mayorkas said Monday.

But in addition to the Congressional inquiries, Cheatle and the Secret Service are also facing an inquiry by the Department of Homeland Security's inspector general.

In a brief notice posted to the inspector general's website Tuesday, the agency said the objective of the probe is to "Evaluate the United States Secret Service's (Secret Service) process for securing former President Trump's July 13, 2024 campaign event."

The agency also said Wednesday it is launching a review of the agency's Counter Sniper Team's "preparedness and operations."

"Our objective is to determine the extent to which the Secret Service Counter Sniper Team is prepared for, and responds to, threats at events attended by designated protectees," the inspector general's office said.

Biden on Sunday said he was ordering an independent review of the security at the rally. No one has yet been named to lead that inquiry.

Since the shooting, Cheatle and the Security Service have come under intense scrutiny over how a gunman could get in position to fire at a former president.

The shooter, Thomas Matthew Crooks, was able to get within 135 meters (157 yards) of the stage where the Republican former president was speaking when he opened fire. That's despite a threat on Trump's life from Iran leading to additional security for the former president in the days before the Saturday rally.

A bloodied Trump was quickly escorted off the stage by Secret Service agents, and agency snipers killed the shooter. Trump said the upper part of his right ear was pierced in the shooting. One rallygoer was killed, and two others critically wounded.

Cheatle said her agency was working to understand how Saturday's shooting happened and to make sure something like it never does again.

Cheatle and FBI Director Christopher Wray participated in a telephone briefing Wednesday afternoon with senators. Republicans came away critical.

Sen. John Barrasso, R-Wyo., tweeted on X that it was a "100% cover-your-ass briefing." Sen. Rick Scott, R-Fla., called for administration officials to hold a daily press conference to share updates with the public, and Sen. Mike Rounds, R-S.D., said "they are so disjointed that they don't have their own facts together yet."

The Secret Service has roughly 7,800 staff members and is responsible for protecting presidents, vice presidents, their families, former presidents, their spouses and their minor children under the age of 16 and a few other high-level Cabinet officials such as the Homeland Security secretary.

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AP writer Stephen Groves contributed to this report.