Security officials to answer for failures during US Capitol riot

Senator Amy Klobuchar (Joshua Roberts/Pool via AP)

Congress is set to hear from former US Capitol security officials for the first time about the massive law enforcement failures on January 6, the day a violent mob laid siege to the building and interrupted the presidential electoral count.

Three of the four people scheduled to testify on Tuesday before two Senate committees resigned under pressure immediately after the deadly attack, including the former head of the Capitol Police.