First Amendment protections are not extended to non-US citizens.
https://www.forbes.com/sites/danielfisher/2017/01/30/does-th...
Simple people imagine that "freedom of speech" is primarily good for the speaker. In fact, it's good for everyone in USA to know true facts about their politicians, no matter who publicizes those facts.
https://www.learnliberty.org/blog/t-he-constitutional-rights...