US President Donald Trump arrives for a rally at Williamsport Regional Airport in Montoursville, Pennsylvania on October 31, 2020. (Photo by MANDEL NGAN / AFP) (Photo by MANDEL NGAN/AFP via Getty Images) President Donald Trump and his reelection campaign are signaling they will pursue an aggressive legal strategy to try to prevent Pennsylvania from counting mailed ballots that are received in the three days after the election.The matter could find its way to the Supreme Court, especially if those ballots could tip the outcome in the battleground state.The three-day extension was ordered by Pennsylvania's top court.