assclownish
Behaving in the manner of an assclown; see Sean Hannity Donald Trump, or any Republican member-of-Congress for poignant examples.
More than 1,000 psychiatrists recently stated that Donald Trump's assclownish behavior is due to his malignant Narcissistic Personality Disorder (NPD), but, to borrow a trite Trumpism other "people say" it's mainly because he is a low-IQ person.