Capitol attack committee requests cooperation from key Republican trio

Bennie Thompson, the Democratic committee chair, told the Guardian last week the panel wanted to conduct interviews with Republicans so it could consider their testimony for its report, due to be published in September.

The panel opted against issuing subpoenas compelling testimony in the first instance, since that could cause the Republicans to attack, whereas an informal interview might at least yield some information, two sources close to the matter said.

In a statement, Jackson refused to cooperate.

House investigators are expected to issue further letters to Republican members of Congress, sources said. The Guardian first reported the committee was considering letters to Marjorie Taylor Greene, Lauren Boebert and Paul Gosar, in addition to Biggs and Brooks.

The panel made a particularly expansive request to Biggs, the former head of the ultra-conservative House Freedom Caucus, outlining four lines of inquiry that investigators want to pursue with respect to his role in the weeks before 6 January.