Tonight on The Last Word: The Supreme Court backs the Trump executive order on mail ballots for now. Also, Donald Trump targets Canada with a new 50% tariff threat for 2027. Plus, Trump threatens sanctions on Iran’s economic partners. And Ohio Democrat Dr. Amy Acton goes after Vivek Ramaswamy for his support of data centers. Sen. Sheldon Whitehouse, Rear Adm. John Kirby, and Dr. Amy Acton join Lawrence O’Donnell.

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