Who is Cassidy Hutchinson? Former aide to Trump's White House chief of staff Mark Meadows testifies in January 6 hearing

Cassidy Hutchinson, a former top aide to President Donald's Trump's White House chief of staff Mark Meadows, testified at a House January 6 committee hearing on Tuesday. The unexpected hearing was announced on Monday, with the committee saying it would present "recently obtained evidence" from an unnamed witness who was later revealed to be Cassidy Hutchinson. But who is she?

Hutchinson is the committee's first live witness who was in the West Wing on Jan. 6, 2021. 

"It's important that the American people hear that information immediately," the committee chairman, Rep. Bennie Thompson, said at the start of the hearing, thanking people like Hutchinson for their courage.