Mr. Trump’s elder daughter Ivanka Trump, his son-in-law Jared Kushner and his son Donald Trump Jr. are among the high-profile witnesses who have testified before the panel. Late in the day on Jan. 6, Mr. Quested and his crew were with Mr. Tarrio in Baltimore, filming him as he responded in real time to news about the riot. Mr. Rosen and Mr. Donoghue have told multiple congressional committees that Mr. Trump and his allies pressured the department to falsely say that it had found voter fraud and to use its power to undo the election results. Last May, Mr. Rosen took part in a public hearing of the House Oversight and Reform Committee on events leading up to the assault on the Capitol. Mr. Pak could have information pertaining to Georgia, a battleground state that Mr. Trump was particularly fixated on.