A French scientist was denied entry into the United States by immigration officials after authorities found messages critical of the Trump administration on his phone.

“I learned with concern that a French researcher on assignment for the French National Center for Scientific Research (CNRS) who was traveling to a conference near Houston was denied entry to the United States before being expelled,” Philippe Baptiste, France’s minister of higher education and research, said in a statement on Monday to Agence France-Presse, or AFP, published by Le Monde.

“This measure was apparently taken by the American authorities because the researcher’s phone contained exchanges with colleagues and friends in which he expressed a personal opinion on the Trump administration’s research policy,” the minister added.

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