The Department of Homeland Security said the academic was denied entry because he had “confidential” data from an American lab, not because of his views on the president’s policies.

A French scientist was denied entry to the United States this month over messages critical of President Trump’s administration’s research policies, according to France’s government.

A French scientist was denied entry to the United States after immigration officials discovered text messages on his phone criticising Donald Trump, which they reportedly considered to be "terrorism".