A federal grand jury issued a subpoena for records of the Arizona state Senate’s audit of 2020 election results in Maricopa County, a Democratic stronghold that President Donald Trump lost that year, contributing to his loss of the state to former President Joe Biden, the Senate president said on Monday.

“The FBI has the records,” wrote Senate President Warren Petersen, a Republican, in a post on the social media site X, which said he received a subpoena for those records last week and that he complied with it.

The issuance of the subpoena suggests that the Department of Justice has expanded its investigation into the 2020 election results, and much-debunked allegations by Trump and supporters of his that he was cheated out of victory that year by widespread ballot fraud.

The subpoena came about five weeks after the FBI raided an election facility in Fulton County, Georgia, and seized ballots from the 2020 election.

Fulton County, like Maricopa County, was the focus of claims by Trump that he was swindled out of victory in 2020.