Trump shooting updates: Shooter flew drone near site hours before shooting

Sen. Ted Cruz, R-Texas, called for Secret Service Director Kimberly Cheatle to resign in a post on X on Monday.

Other Republican lawmakers have called on Cheatle to provide testimony, documents and explanations for the security posture that led to Saturday’s assassination attempt. Multiple committees have launched investigations and Cheatle has accepted an invitation to appear for a public hearing in the House next week.

Cruz’s social media post also called for Homeland Security Secretary Alejandro Mayorkas’ resignation, though this is not the first time that Cruz has called for Mayorkas to step down. He previously made similar calls over Mayorkas' management of the southern border.

-ABC News’ Allie Pecorin

President Joe Biden and Vice President Kamala Harris are receiving a security update in the Situation Room Monday morning, according to the White House.

Among the officials providing updates are Attorney General Merrick Garland, Homeland Security Secretary Alejandro Mayorkas and FBI Director Christopher Wray. Secret Service Director Kim Cheatle and Secret Service Deputy Director Ronald Rowe are participating in the meeting virtually, the White House said.

The House Oversight Committee will receive a briefing from the Secret Service on Tuesday, a source told ABC News.

Secret Service Director Kim Cheatle is then expected to appear for a public hearing in the House on July 22, the source added, citing conversations with the Secret Service. House Oversight Committee Chairman James Comer said on Fox News Monday morning that he's "100% confident" the hearing with Cheatle will happen.

The Secret Service will also brief GOP committee members later on Monday, a source familiar with House Committee on Homeland Security told ABC News.

-ABC News’ Lauren Peller

First lady Jill Biden spoke with former first lady Melania Trump by phone on Sunday afternoon, a White House official told ABC News.

The White House did not share any further details about the call.

-ABC News’ Lauren Peller and Molly Nagle