US House Speaker Nancy Pelosi says Congress will establish an “outside, independent” commission to investigate the 6 January attack on the US Capitol by supporters of Donald Trump.
In a letter to lawmakers, she said the commission would be modelled on the inquiry into the 11 September 2001 attacks on New York and the Pentagon.
“We must get to the truth of how this happened,” she said.
Former President Trump was acquitted by the Senate of inciting the violence.
But Democrats and some Republicans have backed an independent probe into the riots, which left five people dead.
Pelosi said that US Army Lieutenant General Russel Honoré had, over the past few weeks, been assessing the security needs of the Capitol in light of the attack.
“It is clear from his findings and from the impeachment trial that we must get to the truth of how this happened,” she said.
The commission, she said, “would investigate and report on the facts and causes” of the attack; “the interference with the peaceful transfer of power”; and the “preparedness and response” of both the Capitol police and other branches of law enforcement.
She also said that, based on Lt Gen Honoré’s initial findings, Congress needed to allocate additional funding to “provide for the safety of members and the security of the Capitol”.
Trump survived his second impeachment trial – the only president to face the process twice – on Saturday, after Democrat prosecutors failed to secure the two-thirds majority needed to convict him.
The vote split largely along party lines, with the seven Republicans joining the Senate’s 48 Democrats and two independents in voting to convict.
The senior Republican in Congress, Senator Mitch McConnell, had voted against conviction on constitutional grounds, but after the vote declared Mr Trump “responsible” for the assault on the Capitol.
“President Trump is still liable for everything he did while he was in office,” Mr McConnell told the chamber. “He didn’t get away with anything yet.”
Other Republicans have also expressed support for an independent inquiry into the riots, including a close ally of Trump, Senator Lindsay Graham. He told Fox News Sunday that the former president bore some culpability for events on 6 January.
“His behaviour after the election was over the top,” Sen Graham said. “We need a 9/11 commission to find out what happened and make sure it never happens again.”
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