Former Trump strategist Steve Bannon has told the House select committee investigating the 6 January Capitol riots that he is willing to testify.
Until now, he had refused to cooperate with the hearing.
In a letter, his lawyer told the committee that Mr Bannon “is willing to, indeed prefers, to testify at your public hearing”.
Mr Trump said the testimony would be “in the best interests” of Americans.
The select committee has conducted a nearly year-long investigation into how Trump supporters invaded Congress on 6 January 2021 to disrupt lawmakers as they certified Democrat Joe Biden’s election victory.
Mr Bannon was summoned to testify on what he knew about the events leading up to the riot, but until now he had refused to comply.
