There are only some islands who are in the position to effectively restrict travel, and totalitarian states whose numbers can't be trusted.
Infection rates vary by countries, but a lot of it is driven by hotspot outbreaks . And some who seemed to be doing good at first are suddenly getting their hotspot outbreaks at later points.
Those were different incidents, iirc he proposed shutting down travel when news about Covid came from China.
The other "closing of the borders" is about immigration laws. I'm not from the US, but I never understood the anti-Trump position there. Surely, if you have immigration laws, you should try to uphold them. You can criticize the laws and try to change them, but criticizing attempts to uphold the laws makes no sense.
Infection rates vary by countries, but a lot of it is driven by hotspot outbreaks . And some who seemed to be doing good at first are suddenly getting their hotspot outbreaks at later points.