WASHINGTON — The Supreme Court on Tuesday rejected Republicans’ last-gasp bid to reverse Pennsylvania’s certification of President-elect Joe Biden’s victory in the electoral battleground.

The court without comment refused to call into question the certification process in Pennsylvania. Democratic Gov. Tom Wolf already has certified Biden’s victory and the state’s 20 electors are to meet on Dec. 14 to cast their votes for Biden.

Biden won 306 electoral votes, so even if Pennsylvania’s results had been in doubt, he still would have more than the 270 electoral votes needed to become president.

Republican U.S. Rep. Mike Kelly of northwestern Pennsylvania and other plaintiffs pleaded with the justices to intervene after the state Supreme Court turned away their case.

The Republicans argued that Pennsylvania’s expansive vote-by-mail law is unconstitutional because it required a constitutional amendment to authorize its provisions.

Biden beat President Donald Trump by more than 80,000 votes in Pennsylvania, a state Trump had won in 2016. Most mail-in ballots were submitted by Democrats.

The state’s high court said the plaintiffs waited too long to file the challenge and noted the Republicans’ staggering demand that an entire election be overturned retroactively.

In the underlying lawsuit, Kelly and the other Republican plaintiffs had sought to either throw out the 2.5 million mail-in ballots submitted under the law or to wipe out the election results and direct the state’s Republican-controlled Legislature to pick Pennsylvania’s presidential electors.