The Supreme Court delivered a major win to President Donald Trump on Friday in his ongoing war with the federal judiciary, limiting the power of courts to step in and block policies on a nationwide basis in the short term while judges review their legality.

Though the case was intertwined with Trump’s executive order effectively ending birthright citizenship, the ruling does not settle the issue of whether the president can enforce that order. And there were signs that lower courts could move swiftly to block the policy.

But the high court’s decision does mean that Americans seeking to challenge Trump’s future policies may have to jump through additional hoops to succeed. Exactly how that will work remains to be seen and will be hashed out by lower courts in coming days.

Here’s what to know about the court’s decision:

The Supreme Court’s 6-3 ruling could have far-reaching consequences for Trump’s second term, even if his birthright citizenship order is never enforced. That’s because it will limit the power of courts to strike down other policies in the future.