Cassidy Hutchinson will reportedly be among the witnesses testifying before the House Select Committee during the surprise sixth hearing on Tuesday, June 28.

A former top aide of ex-White House Chief of Staff Mark Meadows, who served under former US President Donald Trump, Hutchinson is believed to have key insights into the workings of the Oval Office during the January 6 riots and the storming of the US Capitol. She will also become the first White House employee to offer a live testimony since the televised hearings began.

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According to Hutchinson’s LinkedIn profile, she joined the Office of Legislative Affairs under the White House in March 2019, before being promoted to Executive Assistant to the Chief of Staff, Mark Meadows. She also served as a Special Assistant to the President for Legislative Affairs, posts which put her in the thick of things during the January 6 riots.

Notably, however, Tuesday’s hearing is not the first time Hutchinson is testifying before the House Select Committee. The former White House aid had earlier sat for more than 20 hours of closed-door depositions with Jan 6 investigators, offering key insights, snippets of which were shared during the fifth session of the televised Jan 6 hearings.

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While all the details of her previous, closed-door testimonies are not known, reports by several publications, including Politico and The Washington Post, suggest that Hutchinson could be a key figure in the hearings.

She had earlier shared accounts of how she saw Meadows burning documents in the office, and about how the former White House Chief of Staff had been warned about “potential violence” in the aftermath of the US Presidential elections.

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Meadows also reportedly complained to Hutchinson about Trump’s “positive view of the prospect of hanging the vice president [Mike Pence],” something that she has already confirmed to the Committee.

While the agenda for the sixth Jan 6 hearing is not known, the committee has said that it will “present recently obtained evidence and receive witness testimony,” and Hutchinson’s live testimony is expected to be among the highlights of Tuesday’s hearing.