Tariffs are Trump's favorite foreign policy tool. The Supreme Court could change how he uses them

For President Donald Trump, tariffs — or the threat of them — can bend nations to his will. The president has used them not only as the underpinning of his economic agenda, but as the cornerstone of his foreign policy in his second term. Next week, the Supreme Court hears arguments on whether Trump has overstepped federal law with many of his sweeping tariffs. If the court rules against him, it could limit or even take away the swift and blunt leverage that much of his foreign policy has relied on. Trump has increasingly expressed anxiety about the case on social media and in speeches.