To spend time on former President Donald J. Trump’s corner of social media is to witness any number of contradictory, unproven or outright conspiratorial ideas blooming, all at once. The approaching presidential debate has apparently sent him into overdrive.

On social media and at rallies, Mr. Trump has suggested that President Biden is taking performance-enhancing drugs ahead of the debate. Then, on Monday, he called on Mr. Biden to take a drug test. Mr. Trump banged out the demand on his…


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