The Supreme Court's ruling in a case on birthright citizenship gave an ominous warning to those challenging other Trump policies by curbing the use of nationwide injunctions that barred the order from being implemented all across the country.

But while Republicans rejoiced over the ruling, much of their celebration was focused on what the court signaled with its take on nationwide injunctions — a positive sign for the White House, as it has fumed over lower-court rulings that have blocked their policies.

The high court on Friday instructed lower courts to refashion their nationwide injunctions so they are not broader than necessary to provide complete relief to the 22 states and immigration groups suing. It potentially allows President Trump to begin barring birthright citizenship in the rest of the country for children born to parents who are not citizens themselves.

The ruling did not weigh the merits of Trump’s ban, and the issue is all but certain to return to the court.

The ruling's significance wasn’t lost on Trump, who in a swiftly organized White House press conference rattled off a series of other policies he hoped would get the same treatment by the court.

“The decision signals the loss of one of the best tools lawyers have had in their arsenal for dealing with this administration’s constitutional excesses. It is not the only tool, but it was a significant one,” Joyce Vance, a law professor and former U.S. attorney appointed by former President Obama, wrote on her blog.

Republicans have railed against nationwide injunctions in recent months, furious to see district court judges block the implementation of policies they’ve determined are likely unlawful.

But Democrats say the uptick in nationwide........

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