Trump and Johnson have helped spread a false notion that the New Orleans attacker was an immigrant who entered the country illegally under Biden.Paul Sancya/AP

In the immediate aftermath of the New Year’s truck attack that killed 14 people and injured dozens in New Orleans, President-elect Donald Trump baselessly—and, it turns out, falsely—suggested that the Biden administration’s immigration policies were to blame.

“When I said that the criminals coming in are far worse than the criminals we have in our country, that statement was constantly refuted by Democrats and the Fake News Media, but it turned out to be true,” Trump wrote on Truth Social just after 10:45 a.m. on New Year’s Day. (Later in the post, he added: “Our hearts are with all of the innocent victims and their loved ones, including the brave officers of the New Orleans Police Department.”)

While the attacker, Shamsud-Din Jabbar—who........

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