To add on to Oddthinking's answer, here is a question that was fine for the site based off Trump actions : Did the United States reject an offer by North Korea to freeze their nuclear missile development?
This question was notable and required some digging to resolve the answer to the question. It wasn't trivially verifiable and required digging into news articles dating back to 1993 in order to resolve.
Consider the counterpoint of a hypothetical Skeptics question : "Did Donald Trump compare the impeachment inquiry to a lynching?"
This question is very trivially verifiable (it's in his twitter timeline and has been linked to by dozens of news organizations) and the question itself appears to be nothing more than taking a pot shot at the President.
Question 1 is a legitimate question about actions taken by the Trump organization. Question 2 is "hey everyone look at the stupid thing the president said". Questions of format 2 aren't adding anything of value to the site. I'd like to think we try to keep everything as non-partisan as possible, and although that isn't true 100% of the time, questions like number 2 are obvious closures for mods.
This isn't just a Trump thing either. For the same reasons, a question that asked : "Did Obama say there were 57 states in the union?" would be closed for similar reasons - trivially verifiable and appears to only exist to take pot shots at Obama.