The Democratic-controlled US House of Representatives has voted, with Republican support, for a commission to investigate the Capitol riot.
Thirty-five Republicans defied their party leaders and former President Donald Trump in siding with Democrats by 252-175 to establish the inquiry.
Mr Trump had urged Republicans to vote against the "Democrat trap".
The bill looks unlikely to pass the upper chamber. Top Senate Republican Mitch McConnell called it "slanted".
The inquiry would be modelled on the commission that investigated the 9/11 attacks on New York and Washington.