I had to look up the meaning of "ass clown." Found a detailed discussion of it at Slate:
As a swear, assclown is a newer member of that noble ass- family, sibling to assbag, assbucket, asshat, asshole, asswipe and any number of other ass + NOUN compounds. These formations variously ridicule someone as laughably and contemptibly idiotic, dickish, or worthless. Assclown, however, is a pejorative pie thrown especially in the face of someone who, wrongly, thinks his actions are clever, funny, or worthwhile...
Assclown has also been at the center of political controversy. In 2015, Minnesota sports producer Kevin Cusick had to apologize after suggesting President Obama was an assclown. Cusick put together a slideshow for the St. Paul Pioneer Press online that featured President Obama wielding a selfie stick. He captioned the image, used for larger social commentary on taking selfies as such: “A fool-proof way to make yourself look like a self-absorbed assclown.” ..
And thanks to this presidential election, philosopher Aaron James released Assholes: A Theory of Donald Trump, a timely update to his 2012 Assholes: A Theory...The comment was left on the Divertimento because I had closed comments on the President's Day post
Where does Trump fit in? His type is the Assclown Showman Asshole, with a bit of the Bullshitter and Winner mixed in. And for James, the assclown is specifically “someone who seeks an audience’s enjoyment while being slow to understand how it views him.” When it comes to Trump, that sounds pretty accurate, but I’m certain we can all conjure up some far stronger words.