Federal prosecutors have been seeking documents and testimony about the fake electors scheme and the planning for the rally just before the storming of the Capitol.
Prosecutors said the defendants had used their bodies, furniture, chains and ropes to block the doors to an abortion clinic in Washington in 2020 and had livestreamed their actions on Facebook.
A high-profile ruling about a subpoena from the House committee investigating the Jan. 6 attack turned on a lower standard of proof than a criminal trial.
Representative Jeff Fortenberry announced he would leave his seat at the end of the month, just days after he was convicted on charges of lying to investigators about an illegal campaign donation.