On What Really Matters, Walter Russell Mead discusses Donald Trump’s ban on foreign students at Harvard, the Supreme Court’s decision on the president’s authority to fire federal commissioners, the Senate’s vote against California’s electric vehicle mandate, and a report from the Copenhagen Democracy Summit.

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US President Donald Trump reacts after signing executive orders imposing tariffs on imported goods in the Rose Garden at the White House on April 2, 2025, in Washington, DC. (Andrew Harnik via Getty Images)