The US and the EU commonly impose economic sanctions on wrongdoers and their associates for the purpose of encouraging compliance with international norms. Russian oligarchs close to Putin, for example, have been targeted in this fashion.
If the EU wants to get tough with Trump, why don’t they impose sanctions on him, his family, and his businesses for reneging on the Paris Agreement and the Iran deal and for violating WTO rules? They could refuse entry to him, freeze his assets, and take his golf courses and hotels into receivership until he cleans up his act.
Wouldn’t that piss him off?
Wouldn’t that be great?