Trump is affecting the economy of other countries. The tariffs and the massive uncertainty is causing layoffs and makes companies more hesitant to invest.

The destruction of US scientific institutions has effects on other countries as well, science is very interconnected. It also affects all companies that supply scientific equipment and supply.

The foreign policy has effects on other countries, the US is still the most powerful nation at the moment. And let's assume that there is a chance his threats to invade Greenland or Canada are actually acted upon, that would change world politics in a fundamental way.

Not who you're asking, but the extreme changes in US foreign policy (well, maybe not necessarily policy because I doubt there's much paperwork going on to make the rapidly swinging changes official) are affecting, basically, the stability of global security and making US allies very nervous.

Whilst this is at an international political level, it has effects on individuals world views and therefore psychologies, which can be experienced viscerally.

As an obvious example, I'm sure Ukrainians have gone through some personal ups and downs as a result of the current administrations interpretation of diplomacy.

Every country in the world is severely affected by Trump's reversal of climate change policy.