House Speaker Nancy Pelosi says Congress will establish an “outside, independent” commission to investigate the January 6 attack on the Capitol.

In a letter to lawmakers, Nancy Pelosi said the commission would be modeled on the inquiry into the September 11, 2001, attacks on New York and the Pentagon.

She said: “We must get to the truth of how this happened.”

Former President Donald Trump was acquitted by the Senate of inciting the violence.

However, Democrats and some Republicans have backed an independent investigation into the riots, which left five people dead.

Nancy Pelosi said that retired US Army Lt. Gen. Russel Honoré had, over the past few weeks, been assessing the security needs of the Capitol in light of the attack.

The commission, Nancy Pelosi 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”.

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A group of House Republicans wrote to Nancy Pelosi on February 15 complaining that their party had not been consulted about the general’s security review.

In the letter, they also demanded to know what Nancy Pelosi knew and the instructions she gave to secure the Capitol ahead of January 6.

House Republican Adam Kinzinger, who called for Donald Trump’s removal after the riots, was condemned by 11 members of his family in a handwritten letter, in which they said he was in cahoots with “the devil’s army”.

Donald Trump survived his second impeachment trial on February 13, after Democrat prosecutors failed to secure the two-thirds majority needed to convict him. He is the only president to have faced the process twice.

The vote split largely along party lines, with 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 Donald Trump “responsible” for the assault on the Capitol.

Other Republicans have also expressed support for an independent inquiry into the riots, including a close ally of Donald Trump, Senator Lindsay Graham.