The Jan. 6 select committee tasked with investigating the deadly attack at the Capitol is calling for a trio of House Republicans to cooperate voluntarily with its investigation, according to letters sent to the lawmakers on Monday.

The panel, probing the Capitol riots in which supporters of defeated President Donald Trump tried to overturn President Joe Biden's 2020 victory, wants cooperation from GOP Reps. Andy Biggs, Mo Brooks, and Ronny Jackson.

While it’s unclear whether the Trump-allied lawmakers will comply with the request, members of the panel are hoping they will meet with the committee as soon as next week after the House returns from its recess.

“The Select Committee has learned that several of our colleagues have information relevant to our investigation into the facts, circumstances, and causes of January 6th. As we work to provide answers to the American people about that day, we consider it a patriotic duty for all witnesses to cooperate,” Chairman Bennie Thompson (D-MS) and Vice Chairwoman Liz Cheney (R-WY) said in a statement.

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“We urge our colleagues to join the hundreds of individuals who have shared information with the Select Committee as we work to get to the bottom of what happened on January 6th,” they added.

In the letter to Biggs, of Arizona, the former chairman of the House Freedom Caucus, the committee cited allegations that he helped plan the rally ahead of the breach of the building, as well as accusations certain members of Congress looked to seek pardons from Trump.

The committee cited Brooks’s public comments that the former president “asked me to rescind the election of 2020,” in its request that he appear before the committee. Brooks, of Alabama, recently lost his endorsement from Trump for his 2022 Senate bid.

And in the letter to Jackson, a freshman lawmaker for Texas who was the White House doctor during part of Trump's presidency, pointed to text messages from members of extremist the Oath Keepers saying he needed protection during the riot.

Jackson, though, immediately rejected the request to testify.

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“Yet again, the illegitimate Jan. 6 committee proves its agenda is malicious and not substantive," Jackson said. "It speaks volumes that the committee would choose to share its letter with the media before it was shared with me. I do not know, nor did I have contact with, those who exchanged text messages about me on Jan. 6. In fact, I was proud to help defend the House Floor from those who posed a threat to my colleagues.”