The House committee investigating the Jan. 6 attack on the Capitol sent letters on Monday seeking interviews with three Republican members of Congress, and the panel said it had gathered evidence that some House Republicans sought presidential pardons in the aftermath of the violence that engulfed the Capitol.

The committee is requesting interviews with Representative Andy Biggs of Arizona, the former leader of the ultraconservative House Freedom Caucus; Representative Mo Brooks of Alabama, who has said former President Donald J. Trump has continued to seek reinstatement to office; and Representative Ronny Jackson of Texas, Mr. Trump’s former White House doctor.

In a letter to Mr. Biggs, the committee’s leaders wrote that they wanted to question him about evidence they had obtained about efforts by certain House Republicans to seek a presidential pardon after Jan. 6 in connection with Mr. Trump’s efforts to overturn the 2020 election.

“Your name was identified as a potential participant in that effort,” Representative Bennie Thompson, Democrat of Mississippi, and Representative Liz Cheney, Republican of Wyoming, the leaders of the committee, wrote to Mr. Biggs. “We would like to understand all the details of the request for a pardon, more specific reasons why a pardon was sought, and the scope of the proposed pardon.”