A lot is known about the few hours that shook American democracy to the core. The defeated president’s incendiary speech, the march by an angry crowd to the U.S. Capitol, the breaking in, the beating of cops, the “hang Mike Pence” threats, the lawmakers running for their lives, the shooting death of rioter Ashli Babbitt. All of that chaos unfolded over about eight hours on one day: Jan. 6, 2021.

But for all that is known about the day, piecing together the words and actions of Donald Trump over that time has proved no easy task, even though a president’s movements and communications are closely monitored.

There’s a gap in the official White House phone notations given to the House committee investigating Jan. 6 — from about 11 a.m. to about 7 p.m., according to two people familiar with the congressional investigation into the riot. Details may still turn up; the former president was known to use various cell phones and often bypassed the White House switchboard, placing calls directly.