A decision upholding the tariffs would cement an expansive new exercise of presidential power and preserve a cornerstone of Trump’s agenda that economists estimate could boost some U.S. manufacturing...

President Donald Trump’s power to unilaterally impose far-reaching tariffs is coming before the Supreme Court on Wednesday in a pivotal test of executive power with trillion-dollar implications for t...

The challengers, on the other hand, say that tariffs amount to a domestic tax because they’re paid by American companies that import goods, and taxation belongs to Congress.