The Supreme Court on Monday permitted President Donald Trump to move forward with a controversial executive order targeting mail ballots, but the decision will almost certainly not be the final word in whether the administration can actually implement its far-reaching plan.

At the center of the dispute is an executive order Trump signed in March that gives the US Postal Service an unprecedented role in deciding whether to send mail ballots — a move that has followed years of the president making baseless claims about illegal voting by mail.

But the Supreme Court’s order, which came over the dissent of three liberal justices, doesn’t resolve the legality of Trump’s proposal. The president’s plan for the USPS remains blocked on a nationwide basis. And further court action is almost certain to put Trump’s executive order before the justices again, potentially within a few days.

For now, no voters who expect to cast their ballots by mail in the midterm elections need to change their plans. Still, the high court’s decision handed the president a procedural win on an issue that has been central to his messaging for years. And it is likely to inject uncertainty for both voters and state election officials who are scrambling to prepare for this year’s high profile midterm elections.