A federal appeals court on Sunday agreed to temporarily put on hold a lower court’s order requiring that U.S. Sen. Lindsey Graham testify before a special grand jury that’s investigating possible illegal efforts to overturn then-President Donald Trump’s 2020 election loss in Georgia.

A subpoena had instructed the South Carolina Republican to appear before the special grand jury on Tuesday.

U.S. District Judge Leigh Martin May last Monday denied Graham’s request to quash his subpoena and on Friday rejected his effort to put her decision on hold while he appealed. Graham’s lawyers then appealed to the 11th U.S. Circuit Court of Appeals.

On Sunday, a three-judge panel of the appeals court issued the order temporarily pausing May’s order declining to quash the subpoena. The panel sent the case back to May to decide whether the subpoena should be partially quashed or modified because of protections granted to members of Congress by the U.S. Constitution.

Once May decides that issue, the case will return to the 11th Circuit for further consideration, according to the appeals court order.

Graham’s representatives did not immediately respond Sunday to messages seeking comment on the appellate ruling. A spokesperson for Fulton County District Attorney Fani Willis declined to comment.

Willis opened the investigation early last year, prompted by a Jan. 2, 2021, phone call between Trump and Georgia Secretary of State Brad Raffensperger. During that conversation, Trump suggested Raffensperger could “find” the votes needed to overturn his narrow loss in the state.