The U.S. Supreme Court on Tuesday handed a defeat to Republicans seeking to throw out up to 2.5 million mail-in ballots in Pennsylvania as they try to undo President Donald Trump’s election loss, with the justices refusing to block the state from formalizing President-elect Joe Biden’s victory there. The court in a brief order rejected a request by U.S. congressman Mike Kelly, a Trump ally, and other Pennsylvania Republicans who filed a lawsuit after the Nov. 3 election arguing that the state’s 2019 expansion of mail-in voting was illegal under state law. Pennsylvania was one of the pivotal states in the election, with Biden, a Democrat, defeating Trump after the Republican president won the state in 2016. State officials had already certified the election results. There were no noted dissents from any of the justices on the court, which has a 6-3 conservative majority including three Trump appointees. Trump had urged the Republican-led Senate to confirm his most recent nominee, Justice Amy Coney Barrett, before Election Day so she could participate in any election-related cases. Trump has falsely claimed that he won re-election, making unfounded claims about widespread voting fraud in states including Pennsylvania. Democrats and other critics have accused Trump of aiming to reduce public confidence in the integrity of U.S. elections and undermine democracy by trying to subvert the will of the voters.