On Friday, a U.S. federal appeals court rejected a request by the U.S. President Donald Trump's campaign to block President-elect Joe Biden from being declared the winner of the battleground state of Pennsylvania.

The ruling is yet another significant setback in Trump's long-shot bid to overturn the results of the November 3 election.

"Free, fair elections are the lifeblood of our democracy. Charges of unfairness are serious. But calling an election unfair does not make it so," wrote Stephanos Bibas on behalf of a three-judge panel. "Charges require specific allegations and then proof. We have neither here."

The case could still be appealed to the U.S. Supreme Court.