House Republicans are escalating their investigation into the attempted assassination of former President Donald Trump, subpoenaing Homeland Security Secretary Alejandro Mayorkas for information related to security at the rally. House Homeland Security Chair Mark Green (R-Tenn.) on Friday demanded various records, including security plans for the rally site, Secret Service protocol on the day of the rally and documents and communications about coordination for screening rally attendees. Green also wants any records related to increasing Trump’s security detail since Nov. 15, 2022. Under the terms of the subpoena, the department would have until noon on July 26 to hand over the materials. “On July 14, 2024, the Committee requested specific documents and information relating to the attempted assassination of President Trump. Due to the extraordinary and urgent circumstances under investigation, and with less than four months before the election, the Committee seeks swift and thorough compliance with its requests for documents and information,” Green wrote in a letter on Friday to Mayorkas. He added that his panel needs the subpoenaed information “to effectively carry out oversight of the Department’s handling of security for presidential candidates and other high-profile protectees, as well as to fully evaluate potential legislation to reform the Department’s handling of this responsibility.” Green’s committee is one of several investigating Saturday’s shooting. Green invited Mayorkas, FBI Director Christopher Wray and Secret Service Director Kimberly Cheatle to testify before his panel on Tuesday. The FBI declined that invitation earlier this week. Green noted in his letter to Mayorkas that DHS had also declined to have the secretary appear on Tuesday and that the committee is still waiting for a response about Cheatle’s appearance. Green added in his letter that his committee has been trying to set up a phone call for him with Mayorkas but has so far been unable to do so. “This lack of cooperation is unacceptable and must come to an end,” he added. Cheatle will testify before the House Oversight Committee on Monday, and Wray is expected to testify before the House Judiciary Committee next week. The latter’s appearance was already on the books before Saturday’s shooting, but Judiciary Chair Jim Jordan (R-Ohio) warned Wray in a letter this week to expect many questions about the assassination attempt. In addition to Wray, Mayorkas and Cheatle, Green has also said he wants to hear from state and local law enforcement. He did not announce a date for that hearing but said it would be in the coming days. Secret Service Director Kimberly Cheatle will appear before the House Oversight Committee on Monday, the Secret Service said Friday, capping off a back-and-forth with the panel. “Secret Service Director Kimberly Cheatle will testify before the House Committee on Oversight on Monday. The Secret Service is fully accountable for the safety of its protectees," Anthony Guglielmi, a spokesperson for the Secret Service, said in a statement. "We are committed to better understanding what happened before, during and after the assassination attempt of former President Trump to ensure it never happens again. That includes complete cooperation with Congress, the FBI and other relevant investigations." Secret Service confirming Cheatle’s appearance on Monday comes after Oversight Chair James Comer (R-Ky.) issued a subpoena for her to appear on Monday. The Department of Homeland Security subsequently sent a letter to Comer asking if the hearing could be delayed until later in the week, or the week of July 29, “given her travel and operational commitments.” Comer, however, rejected that request, vowing to go forward with the hearing on Monday. And Comer and Rep. Jamie Raskin (D-Md.), in a rare joint statement Friday, said Cheatle “must appear” on Monday “to answer our many questions and provide the transparency and accountability that Americans deserve and that are at the foundation of our government.” “While we often have passionate disagreements about policies and investigative priorities, we are united in condemning all political violence and ensuring that America will prevent such a horrific event from ever happening again,” the two said. Cheatle was part of a team that briefed lawmakers earlier this week, when she acknowledged that Saturday was a “failure.” But Republicans fumed after the virtual meetings that they were given little time for questions and got few new details since the discussion was unclassified. The House Oversight Committee is one of several panels investigating Saturday’s assassination attempt of former President Donald Trump. House Homeland Security Chair Mark Green (R-Tenn.) has also invited Cheatle to testify before his panel on Tuesday. Speaker Mike Johnson is expected to announce a bipartisan task force Monday to streamline the House’s investigation.