Daniel Cameron has joined in the fight to dispute Donald Trump’s loss in the 2020 presidential election, The Courier-Journal reported. The Kentucky attorney general and a group of nine other Republican AGs signed an amicus brief asking the U.S. Supreme Court to toss Pennsylvania mail-in ballots that were received after Election Day.

“Today I joined my colleagues in amicus brief asking the U.S. Supreme Court to reverse the absentee ballot ruling of the Pennsylvania Supreme Court,” he said in a statement. “Our action…is about ensuring that the rule of law is upheld during the election process.”

Last month, Pennsylvania’s highest court voted in favor of counting ballots postmarked by Nov. 3 and received by Nov. 6, but Cameron and the other GOPs believe the state “exacerbated the risk of mail-in ballot fraud.”

“The Pennsylvania Supreme Court’s ruling allowed absentee ballots to be counted without a legible postmark and overrode ambiguous state law passed by the Pennsylvania legislature. This should concern all Americans, regardless of political affiliation,” Cameron continued. “My interest in this is not about courts dictating who wins or loses, but about transparency and rule of law issues that should give all Americans the confidence that the election was conducted fairly. Ultimately, we all have to accept the results, and it will be hard for some people to do that if they think issues like these go unexplored.”

Trump’s team — who has been fighting for the president’s reelection — has also questioned the validity of Pennyslvania mail-in votes. In their latest lawsuit, they argued the ballots “lacked all of the hallmarks of transparency and verifiability that were present for in-person voters.”

Joe Biden pulled ahead with more than 43,000 votes in Pennsylvania on Sunday (Nov. 7), winning the state and earning the 20 electoral votes needed to become the nation’s president-elect. Trump, however, has refused to concede defeat.