The next Jan. 6 hearing is Monday: What we learned from all 9 hearings this year

Corrections & Clarifications: This story has been updated to correctly identify the committee's chair, Rep. Bennie Thompson.

The curtains will soon close on Congress' 18-month investigation into the role former President Donald Trump played in the Jan. 6, 2021 U.S. Capitol attack, with the committee's closing hearing scheduled for Monday and its final report set to be released by Christmas.