Pro-Trump extremists attacked the U.S. Capitol on Jan. 6. The acting U.S. Capitol Police chief apologized to Congress Tuesday for the department’s failure to secure the building.

WASHINGTON D.C., USA – JANUARY 6: US President Donald Trumps supporters gather outside the Capitol building in Washington D.C., United States on January 06, 2021. Pro-Trump rioters stormed the US Capitol as lawmakers were set to sign off Wednesday on President-elect Joe Biden’s electoral victory in what was supposed to be a routine process headed to Inauguration Day. (Photo by Tayfun Coskun/Anadolu Agency via Getty Images)