Hearings into the attack on the U.S. Capitol begin on Tuesday.
It’s been more than a month and a half since a violent mob stormed the building and interrupted the counting of electoral vote.
Former security officials will testify before the U.S. Congress on what went wrong.
Three of the four testifying resigned under pressure immediately after the attack, including the former head of the Capitol Police.
Former Senate Sergeant-at-Arms Michael Stenger and former House Sergeant-at-Arms Paul Irving will be speaking publicly for the first time since their resignations.