E.g. This story of the French researcher which started as, "A French scientist has been denied entry into the United States, apparently because the scientist had expressed a personal opinion on the Trump administration's research policy"
In fact turned out to be, "The French researcher in question was in possession of confidential information on his electronic device from Los Alamos National Laboratory — in violation of a non-disclosure agreement— something he admitted to taking without permission and attempted to conceal,”
https://www.nytimes.com/2025/03/21/world/europe/us-france-sc...