Comment by GlobalFrog

Basically, he didn't say anything. At the entry point, he was asked to show his phone (unlocked) and computer. On one of them, in some messages he exchanged with a colleague, he was criticizing the politics of Trump in research and science. Then, he was threatened to be charged with terrorism, because his exchange with his colleague was 'hainous against Trump' and 'conspiracy ridden'. Charges were dropped after he was denied entry and his computed and phone confiscated.