House Republicans promoted Tucker Carlson’s report falsely portraying the attack on the Capitol as a largely peaceful event, while Senate Republicans condemned it.
Representative Zoe Lofgren, Democrat of California and the chairwoman of the Administration Committee, raised questions in a lengthy letter to J. Thomas Manger, the Capitol Police chief.
Capitol security officials announced they would beef up protection after the attack, but lawmakers and experts say gaping holes in the system have long persisted.
The committee released surveillance footage of a Capitol complex tour on Jan. 5 and video of a man it said was part of the tour marching toward the Capitol during the riot.