At last week’s debate, Vice President Kamala Harris warned that Donald Trump has “a detailed and dangerous plan called Project 2025” that he “intends on implementing if he were elected again.” Project 2025 is the subject of an ad blitz from the Harris campaign. It also was a centerpiece of her convention address and remains a refrain in her stump speech. “I can’t believe they put that thing in writing,” she said.

Here’s the problem: Trump didn’t put it in writing; the Heritage Foundation did. It is a policy wish list dreamed up by conservative activists — some associated with Trump but many of them not — and Trump has repeatedly repudiated it. “They know it’s been disavowed,” Trump told me in an interview at Mar-a-Lago this week, but “they have ads about it because they’re lying people.”

Vice-presidential nominee Tim........

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