The Netherlands has issued a new warning to Dutch citizens considering travel to the United States if they are gay, lesbian, transsexual, or another gender or sexual minority. The Dutch government also warned, “The US government has tightened entry controls for foreign visitors,” echoing similar concerns raised by other countries, including the United Kingdom and Germany, in messages to their citizens.
It appears that these countries now have some form of warning associated with travelling to the USA:
You can add Denmark. We recently had an official warning for trans people.
Thanks, edited.
That list should be larger. Where the hell is Mexico?
This was what I could find. Several Caribbean countries are seeking clarification about their status, but that appears to be a blockade by the USA, rather than the other way around.
Similarly, the World Bank has advised its Columbian employees to avoid travelling to the USA after several were apparently deported.
Edit: Added Mexico after receiving this link:
https://www.gob.mx/salud/documentos/aviso-preventivo-de-viaje-por-sarampion-en-texas-ee-uu