A judge in South Carolina ordered the former White House chief of staff to comply with a subpoena from a grand jury in Georgia in order to testify in the investigation.
A day before the order came, a lawyer for the former congressman said the subpoena should be blocked.
The grand jury is looking into efforts by former President Donald Trump and his associates to get Georgia election officials to reverse the victory of President Joe Biden.
Georgia authorities had to ask a judge in South Carolina to forceMeadows to comply with the subpoena because he is not a resident of the state.
The then-president urged the Georgia Secretary of State to get enough votes to win the state during a phone call in January of 2021.
Before a joint session of Congress was due to certify the results of Biden's win in the Electoral College, the call came days before.
The spokesman for the Fulton County District Attorney wouldn't comment on the order.
A number of Trump allies and lawyers have been subpoenaed by the grand jury.
The speech and debate clause of the U.S. Constitution protects members of Congress from legal risk if they make comments about legislative business.
Graham claims that his call to Raffensperger was part of a legislative inquiry.
The judge in Graham's case refused to block the subpoena because he could not be asked about some of the call that could be related to the inquiry.
The 11th Circuit Court of Appeals denied Graham's request to delay the subpoena, saying he had not shown he would win an appeal. There is disagreement about whether his phone calls with Georgia election officials were legislative investigations.
Clarence Thomas stopped the subpoena for Graham.
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