WASHINGTON (AP) — A majority of Supreme Court justices seem skeptical about President Donald Trump’s ability to unilaterally impose far-reaching tariffs, putting at risk a cornerstone of his agenda in the biggest legal test yet of his boundary-pushing presidency. Three conservative justices raised questions Wednesday about whether an emergency law gives Trump near-limitless power to set and change duties on imports, with potentially trillion-dollar implications for the global economy. Challengers say Trump is illegally using the emergency law and American small businesses are paying the price. The Republican president says a ruling against him would be catastrophic for the economy.