The U.S. Supreme Court on Wednesday handed down a pair of closely watched decisions allowing Pennsylvania and North Carolina to accept absentee ballots that arrive after Election Day, prompting a sigh of relief among voting rights advocates who were dreading the possibility of mass invalidation of late-arriving ballots.

But analysts were quick to warn the high court’s decision in the Pennsylvania case left open the possibility that ballots arriving after November 3 could be tossed out by the Supreme Court at a later date—a move President Donald Trump has repeatedly made clear he would welcome.

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