HARRISBURG — Republican lawmakers in Pennsylvania asked the U.S. Supreme Court on Monday to put a hold on a ruling in the presidential battleground state that extends the deadline in November’s election to receive and count mailed-in ballots.

Republicans, including President Donald Trump’s campaign, have opposed such an extension, arguing that it violates federal law that sets Election Day as the first Tuesday in November and that such a decision constitutionally belongs to lawmakers, not the court.

Republicans also object to a portion of the state court’s ruling that orders counties to count ballots that arrive during the three-day extension period even if they lack a postmark or legible postmark, unless there is proof they were mailed after polls closed.

“This is an open invitation to voters to cast their ballots after Election Day, thereby injecting chaos and the potential for gamesmanship into what was an orderly and secure schedule of clear, bright-line deadlines,” lawyers for the Senate’s two top Republicans wrote.

The state Democratic Party and its allies had sought an extension of Pennsylvania’s Election Day deadline to count mailed ballots as their voters are requesting mail ballots at a nearly 3-to-1 ratio over Republicans.