WASHINGTON — President Donald Trump signaled that he would ask the Supreme Court as soon as today to overturn a ruling that found many of his punishing tariffs to be illegal, claiming that an erosion in his power to wage a global trade war would inflict severe financial damage on the United States.

Trump said the administration would ask the justices to render their decision on an “expedited” timeline, as he argued that the new legal uncertainty surrounding his tariffs had contributed to a recent drop in financial markets and could lead to “devastation for our country.”

“If you took away tariffs, we could end up being a third-world country,” Trump said at the White House.

While economists broadly believe the president has overstated the magnitude of the case, the fate of his tariff powe

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