With the stroke of a pen, the U.S. Supreme Court wreaked havoc on President Donald Trump’s favorite method of wielding leverage over other countries.

The justices’ landmark ruling Friday striking down the administration’s global tariffs marks a significant blow to a president who relishes exerting unilateral power to achieve his goals — something he did virtually unchecked during his first year in office. Trump quickly announced plans to reimpose the duties, but the other means available to him are far less nimble.

"It’s one of the most important moments of the presidency so far,” said Josh Lipsky, who leads international economics work at the Atlantic Council, a Washington think tank.

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