He's trying to get things like this and Greenland in the headlines so that he can do the actually harmful things without too much notice.

This is a distraction

This is what Trump does day to day, spouting random made up shit on a whim. My guess is that it was ad libbed and there is no legislation, the whole renaming thing is probably news to his speech writer/diaper changer/whatever they call the person that tries to get him to talk about something specific.

The horrible shit is orchestrated by all the malicious fucks around him who can focus on one topic for more than 5 minutes.