Donald Trump's former White House counsel Pat Cipollone was subpoenaed Wednesday for a deposition by the House's Jan. 6 committee -- and his team is now engaging on the ultimate scope of the order for future testimony, sources say.

"The Select Committee's investigation has revealed evidence that Mr. Cipollone repeatedly raised legal and other concerns about President Trump's activities on January 6th and in the days that preceded," the Jan. 6 committee's chair and vice-chair, Mississippi Democrat Bennie Thompson and Wyoming Republican Liz Cheney, said in a statement.

Cipollone is evaluating the subpoena and his team is involved with the committee on the parameters surrounding an eventual closed-door deposition, sources close to him told ABC News.

There is an expectation that he and the committee will reach an agreement on the terms by the requested deposition date of July 6, though sources emphasize the fluid nature of the talks.