President Donald Trump on Monday called on Senate Republicans to pass the SAVE America Act, arguing the legislation is more important than ever after the Supreme Court upheld state laws allowing some mail-in ballots received after Election Day to be counted.

The president noted the House has already approved the measure three times and urged the Senate to follow suit.

"In light of the tremendous loss in the Supreme Court today concerning Voter's Rights, and the fact that 'people's' votes are allowed to be counted LONG AFTER an Election is over, it is more important than ever to pass THE SAVE AMERICA ACT," Trump wrote in a Truth Social post.

Trump said the bill would require all voters to show photo identification, require proof of U.S. citizenship, and prohibit mail-in ballots except in cases involving illness, disability, military deployment, or travel.

"There is no excuse for a politician, or otherwise, to be against the above three requirements," Trump wrote. "There is only one reason to oppose — CHEATING!"

Trump also wrote: "The House of Representatives has approved this vital Act, THREE TIMES. The United States Senate seems unable to do so."

The president went on to argue that "in a time when there is a powerful Communist Movement taking place in our Country," GOP Sens. Lisa Murkowski, Susan Collins, Thom Tillis, Bill Cassidy, and Mitch McConnell "must vote to SAVE OUR COUNTRY."

"There can be no more excuses!" Trump concluded.

Trump's appeal came after the Supreme Court voted 5-4 to uphold Mississippi's law allowing mail-in ballots postmarked by Election Day to be counted if they arrive within five business days after the election.

Justice Amy Coney Barrett wrote the majority opinion, joined by Chief Justice John Roberts and the court's three liberal justices. Justices Samuel Alito, Clarence Thomas, Neil Gorsuch, and Brett Kavanaugh dissented.

The ruling leaves intact Mississippi's absentee ballot law and similar policies allowing post-Election Day receipt of absentee ballots in about 30 states and the District of Columbia. Republicans challenging the law argued federal election statutes require ballots to be received by Election Day, while Mississippi maintained ballots cast on time may still be counted if they arrive within the state's prescribed deadline.

Trump has repeatedly advocated stricter election laws, including voter ID requirements, proof of citizenship, and tighter limits on mail voting, saying such measures are needed to protect election integrity ahead of this year's midterm elections.