The Senate Homeland Security and Governmental Affairs Committee announced a bipartisan investigation Monday aimed at getting to the bottom of the “security failures” that led to the attempted assassination of former President Donald Trump.

Sen. Gary Peters, the Democratic chairman from Michigan, and Sen. Rand Paul of Kentucky, the top Republican on the panel, said they have requested an “urgent” briefing for their committee and will demand a public hearing to air the issues by Aug. 1.

The senators fired off a letter to Homeland Security Secretary Alejandro Mayorkas and FBI Director Christopher Wray asking for continuous updates on the government’s own investigation into the lapses that led to the shooter getting a line of sight on Mr. Trump at a campaign rally Saturday in Pennsylvania.

“Our committee is focused on getting all of the facts about the security failures that allowed the attacker to carry out this heinous act of violence that threatened the life of former President Trump, killed at least one person in the crowd, and injured several others,” Mr. Peters said.

Mr. Paul vowed to “leave no stone unturned” in the investigation.

In the House, the Oversight and Accountability Committee is also pushing forward with an investigation.

Chairman James Comer said Monday he has scheduled a hearing for July 22 and Secret Service Director Kimberly Cheatle will testify.

“The United States Secret Service has a no-fail mission, yet it failed on Saturday when a madman attempted to assassinate President Trump, killed an innocent victim, and harmed others,” Mr. Comer said.

He praised the agents who rushed to Mr. Trump after the shots, but said “questions remain about how a rooftop within proximity to President Trump was left unsecure.”

Mr. Trump has been under Secret Service protection since late 2015, when he became a leading contender for the GOP presidential nomination. He kept protection after he left office as a former president, overlapping with his new campaign to reclaim the White House.

President Biden has said Mr. Trump was given all the security he requested.

• Stephen Dinan can be reached at sdinan@washingtontimes.com.