John Eastman, the University of Colorado Boulder's 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. (Photo by Andy Cross/MediaNews Group/The Denver Post via Getty Images)
CNN  — 

John Eastman has appeared before the Fulton County grand jury investigating former President Donald Trump’s efforts to overturn 2020 election in Georgia, according to a statement released Wednesday by his attorneys.

Eastman, the conservative attorney who authored a memo outlining a six-step plan for then-Vice President Mike Pence to overturn the election and award Trump a second term was advised to “assert attorney client privilege and the constitutional right to remain silent where appropriate,” the statement says.

“Out of respect for grand jury secrecy we will not disclose the substance of the questions or testimony. We wish to thank the grand jurors for their service,” it adds.

The Atlanta-area special grand jury subpoenaed Eastman in July along with former Trump lawyer Rudy Giuliani, South Carolina Sen. Lindsey Graham and a handful of the Trump campaign’s other former legal advisers, including Jenna Ellis, Cleta Mitchell and Kenneth Chesebro.

Fulton County District Attorney Fani Willis has been leading the investigation digging into Trump’s actions in Georgia. Several state officials have already been subpoenaed and appeared before the special grand jury.

Giuliani’s grand ju