WATCH: Senate committee hearing on oversight of U.S. Capitol Police after Jan. 6 insurrection

The Senate Rules and Administration Committee held a hearing on U.S. Capitol Police oversight following the Jan. 6 Capital Insurrection.

Watch the hearing in the player above.

USCP Inspector General Michael Bolton testified at the hearing on the attack that followed then-President Donald Trump’s remarks at a nearby ‘Stop the Steal’ rally, and left at least five dead, injured nearly 140 police officers, and caused extensive damage to the Congressional complex.

An independent review published in November concluded that the Defense Department and its top leaders acted appropriately before and during the insurrection, despite sharp criticism from some local and congressional leaders that the military did not respond quick enough as protesters breached the building.

The Defense Department’s Office of Inspector General said military and defense leaders “did not delay or obstruct” the department’s response. It said decisions made by two officials at the time, acting Defense Secretary Chris Miller and Army Secretary Ryan McCarthy, “were reasonable in light of the circumstances that existed on that day and requests from D.C. officials” and the Capitol Police.

Criticism has centered on the fact that it took about three hours for members of the District of Columbia National Guard to respond to the Capitol — a timeline the Pentagon has defended as appropriate and necessary to determine the mission, equipment and riot preparedness of the citizen-soldiers and get new orders approved and delivered to commanders.