John Eastman, the University of Colorado Boulders visiting scholar of conservative thought and policy, speaks about his plans to sue the university at a news conference outside of CU Boulder on Thursday, April 29, 2021.

John Eastman, the attorney facing criminal charges for his efforts to overturn former President Donald Trump's 2020 election loss, surrendered at a jail in Atlanta on Tuesday.

Eastman was booked and released from the Fulton County Jail shortly before noon. Outside the jail, Eastman told NBC News that he "absolutely" still believed the 2020 election was stolen.

"No question in my mind," said Eastman, who added that he was paying his own legal fees in the case.

Eastman is one of 19 co-defendants, including Trump, facing charges in the Georgia criminal case led by Fulton County District Attorney Fani Willis.

Eastman penned an infamous memo outlining the dubious legal theory that then-Vice President Mike Pence had the authority to reject key Electoral College votes while he presided over a joint session of Congress on Jan. 6, 2021.

Eastman faces nine counts of crimes including racketeering, conspiracy to commit forgery and filing false documents.