This view shows the deadly Jan. 6 Capitol assault by Trump's followers. File photo

The then-president dismissed concerns that some supporters gathered for his fiery speech outside the White House that day carried AR-15-style rifles, instead asking security to stop screening attendees with metal-detecting magnetometers so the crowd would look larger, the aide testified.

"Take the effing mags away; they're not here to hurt me," Cassidy Hutchinson, who was a top aide to Trump's then-White House Chief of Staff Mark Meadows, quoted Trump as saying that morning.

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Hutchinson, in testimony on the sixth day of House of Representatives hearings into the deadly Jan. 6 Capitol assault by Trump's followers, said the conversation was relayed to her by Tony Ornato, a senior Secret Service official who was Trump's deputy chief of staff for operations.

The New York Times and NBC, citing sources in the Secret Service, said the head of Trump's security detail, Robert Engel, and the limousine driver were prepared to testify under oath that Trump never lunged for the steering wheel. Engel was in the room when Ornato relayed the story, Hutchinson said.

Cassidy Hutchinson testifies in the Cannon House Office Building on Capitol Hill in Washington. AFP

The New York Times and CNN, citing unnamed sources, said Ornato also denied the story and was willing to testify.

Citing her conversation with Ornato, Hutchinson testified that Trump struggled with Secret Service agents who insisted he return to the White House rather than join supporters storming the Capitol where Congress was meeting to certify Democrat Joe Biden's victory over him in the presidential election.

Trump's supporters were roused by his false claims that his 2020 election defeat was the result of fraud

"'I'm the effing president. Take me up to the Capitol now,'" Hutchinson quoted an enraged Trump as saying. She said Trump tried from the back seat to grab the steering wheel of the heavily armored presidential vehicle and lunged in anger at a Secret Service official.

Trump, a Republican, denied her account of his actions.

Donald Trump speaks during a meeting. File photo

"Her Fake story that I tried to grab the steering wheel of the White House Limousine in order to steer it to the Capitol Building is 'sick' and fraudulent," Trump wrote on Truth Social, his social media app.

In a statement, the Secret Service said it was cooperating fully with the committee and would continue to do so.

"We learned of the new information shared at today’s hearing and plan on responding formally and on the record as soon as they can accommodate us," it added.

Hutchinson's lawyer Jody Hunt wrote on Twitter that she had "testified, under oath, and recounted what she was told. Those with knowledge of the episode also should testify under oath."

Dozens of courts, election officials and reviews by Trump's own administration rejected his fraud claims, including outlandish stories about an Italian security firm and the late Venezuelan President Hugo Chavez's tampering with US ballots.

Four people died the day of the attack, one fatally shot by police and the others of natural causes. More than 100 police officers were injured, and one died the next day. Four officers later died by suicide.

Reuters