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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Bucket-wheel excavators mine rare earth materials on Ukrainian soil on February 25, 2025, in the Zhytomyr region of Ukraine. (Kostiantyn Liberov via Getty Images)