Jan. 6 hearing live updates: Focus on Trump's '187 minutes' of inaction during attack

A revelation about deleted text messages by the Secret Service is looming large over Thursday’s hearing.

The House committee subpoenaed the agency earlier this month for text messages sent on Jan. 5 and Jan. 6, 2021. But the agency said most of those records were lost in a planned data migration.

So far, the Secret Service has provided a single text exchange to the Department of Homeland Security inspector general investigating the agency's record-keeping, according to an agency letter to the House Jan. 6 committee obtained by ABC News on Wednesday.

The committee is suggesting the Secret Service broke federal records keeping laws. Hours before the hearing, news broke that the Department of Homeland Security's inspector general has turned the inquiry into a criminal investigation.

The House select committee plans to focus Thursday night's hearing on what it says was Trump's dereliction of duty to act to stop the insurrection.

"It's obvious the president was derelict in his duty, but for all the details you have to watch," Rep. Adam Kinzinger, R-Ill., who is co-leading the hearing, told ABC Congressional Correspondent Rachel Scott.

Rep. Adam Kinzinger, R-Ill., on Thursday morning teased snippets of depositions previewing testimony from Kayleigh McEnany, former press secretary; Ret. Lt. Gen. Keith Kellog, then-national security adviser to Vice President Mike Pence; Molly Michael, Trump's former executive assistant; and Pat Cipollone, the White House counsel at the time.

In the montage, the former White House officials recall how Trump was in the private dining room off the Oval Office watching television as the violence unfolded.

"To the best of my recollection, he was always in the dining room" McEnany said in her deposition.

Rep. Adam Kinzinger, R-Ill., and Rep. Elaine Luria, D-Va., will lead tonight's hearing.

Luria previously told "GMA 3" she and Kinzinger will analyze step-by-step the 187 minutes between Trump's speech at the Ellipse and his statement later that afternoon to the nation telling rioters to go home. The committee, she said, will provide the most detailed timeline yet of Trump's response to the insurrection.

"He didn't take the leadership role as the President of the United States, as the commander in chief," Luria said.

© Bloomberg via Getty Images Representative Elaine Luria attends a hearing of the Select Committee to Investigate the January 6th Attack on the US Capitol in Washington, July 12, 2022.

Two former White House aides are expected to testify before the committee on Thursday, sources previously confirmed to ABC News.

Those ex-staffers are Sarah Matthews, who served as deputy press secretary, and Matthew Pottinger, who was deputy national security adviser. Both resigned from their positions after the pro-Trump mob stormed the Capitol on Jan. 6, 2021.

© The Washington Post via Getty Images, FILE Matthew Pottinger, Assistant to the President and Deputy National Security Advisor listens during a briefing with members of President Trump's Coronavirus task force in the briefing room at the White House, Jan 31, 2020.

At the committee's June 16 hearing, a clip from Matthews' prior testimony was played in which she described what it was like on the White House press team as the insurrection unfolded. She said that Trump's tweet attacking then-Vice President Mike Pence during the attack "felt like he was pouring gasoline on the fire."

© Bloomberg via Getty Images Sarah Matthews, White House deputy press secretary, listens during a news conference at the White House in Washington, July 8, 2020.