(Bloomberg) -- A former White House aide’s account of then-President Donald Trump lunging for the steering wheel of his armored vehicle is facing closer scrutiny a day after her vivid testimony to a House panel investigating the Capitol insurrection.

Tony Ornato, a long-time Secret Service agent who was working at the time as a deputy chief of staff to Trump, has told people that Cassidy Hutchinson’s account to the House committee isn’t consistent with his understanding of the incident, according to a person familiar with Ornato’s denial who spoke on condition of anonymity.

That would contradict Hutchinson’s testimony Tuesday that Ornato shared the account with her shortly after the motorcade returned to the White House. Ornato and Bobby Engel, a Secret Service agent who at the time headed Trump’s security detail and was in the vehicle, are willing to testify under oath that the description the committee heard isn’t correct, the person said.

Some Democrats argue that Hutchinson’s testimony isn’t undermined until Ornato and Engel present a contradictory account under oath rather than through anonymous surrogates in the press. They also note that Hutchinson never claimed to witness the steering wheel incident and instead testified she had heard from Ornato about it.

Ornato and Engel have said Trump was upset by the Secret Service decision that he couldn’t go to the Capitol for safety reasons and grumbled about it, the person said.

The pushback on one of the hearing’s most vivid moments risks undermining the credibility of a key witness with insight into Trump’s actions before and during the Jan. 6 attack on the Capitol. While Hutchinson said her account of Trump’s conduct in the vehicle was second-hand, most of the rest of her testimony covered events she personally witnessed.

Hutchinson’s testimony did provide significant first-person recollections from her that Trump was irate about not being allowed to the Capitol, which are not being disputed.

Hutchinson, a former executive assistant to then-White House chief of staff Mark Meadows, gave a portrait of a president raging and callous to the dangers he was creating during his final weeks in office. She described broken porcelain on the floor and ketchup on the wall after Trump learned his attorney general denied claims of election fraud. She said Trump had been informed protesters gathered for his speech on Jan. 6 were armed with weapons but went ahead with incendiary rhetoric and even tried to get the Secret Service to suspend weapons checks.

Republican pollster Frank Luntz, who described Hutchinson’s testimony as “devastating” to Trump, said how the pushback on her version of the incident plays out will be crucial in shaping public perceptions of her entire account.

“Credibility matters more than any other attributes in situations like this,” Luntz said. “People don’t trust Donald Trump. They did trust Cassidy Hutchinson. The tragedy here is that it was the one area she talked about where she wasn’t present.”

Anthony Guglielmi, a spokesman for the Secret Service, said the agency would make available anyone that the House committee wished to testify and that Ornato and Engel are willing to return to testify to the panel. Both agents had previously been interviewed by the committee.

The Jan. 6 panel welcomes anyone who wishes to provide additional information under oath, said a committee official who asked not to be identified.

That official would not comment when asked whether Hutchinson’s credibility was undercut in any way by the Secret Service agents’ descriptions, or whether the panel will seek to schedule reappearances by Engel and Ornato.

Hutchinson said Tuesday that Ornato gave her the account of the incident while Engel was with them and Engel didn’t disagree with any of the details at the time.

“The president reached up toward the front of the vehicle to grab at the steering wheel. Mr. Engel grabbed his arm, said Sir, you need to take your hand off the steering wheel,” Hutchinson said. “Mr. Trump then used his free hand to lunge toward Bobby Engel and Mr. Ornato had recounted this story to me he had motion toward his clavicles.”

Her attorney, Jody Hunt, tweeted “Ms. Hutchinson testified, under oath, and recounted what she was told. Those with knowledge of the episode also should testify under oath.”

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