[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.

[gambiting]

How do you know this?

edit: I see this has been now downvoted below zero, but the information posted here isn't in any of the official communications about it, so I think it's fair to ask where it came from, no?

[kergonath]

It’s in the article.

[gambiting]

That's all the article says, so it doesn't match everything OP said. So either OP made it up, or there is another source in case it's exactly what I'm asking for.

"According to a diplomatic source to AFP, the incident occurred on March 9. The space researcher was reportedly subjected to a random check upon arrival, during which his work computer and personal phone were searched. The same source also reported that messages discussing the Trump administration's treatment of scientists were found. He was reportedly accused of messages "that reflect hatred toward Trump and can be described as terrorism ." His professional and personal equipment was reportedly confiscated, and the researcher was sent back to Europe the next day."