On March 4, 2024, the claim that the Biden administration had secretly flown 320,000 migrants into the U.S. in 2023 went viral. That claim originated from a report by the Center for Immigration Studies, a conservative think tank. The report, and its assertions, gained significant exposure when the Daily Mail covered it and Elon Musk shared the Daily Mail article on X (formerly known as Twitter). Former U.S. President Donald Trump also repeated the claim in his Super Tuesday victory speech on March 5, 2024. The central assertions made by CIS, repeated by the Daily Mail or others, were that:...