Texas gerrymandering with an overt publicly stated goal to bias the election is enough evidence. But if you want more: sending the military to intimidate politicians (Newsom), deporting and arresting people with permanent residency or other forms of legal immigration, arresting citizens without cause, intimidating law firms, journalists, and news companies by using the power of the executive branch to punish individuals and organizations, illegally dismantling congressionally established governmental organizations and branches.

This is just a small summary. Foreigners are not visiting the US, not because they don't want to or don't like the US, but because they are afraid of visiting a non-free country. It's not worth the risk of getting detained because you posted a negative comment online about a government official.