But now, the terrorist group have made their official first statement about him, and it's a little chilling.
Reuters reports, "America you have drowned and there is no savior, and you have become prey for the soldiers of the caliphate in every part of the earth, you are bankrupt and the signs of your demise are evident to every eye," al-Muhajer said in a recording. "There is no more evidence than the fact that you are being run by an idiot who does not know what Syria or Iraq or Islam is."
Since Trump came into presidency, he has been working to defeat ISIS. He even attempted a Muslim ban.
Business Insider have pointed out that ISIS commonly target U.S. presidents using propaganda, just like today's statement.
"This is about convincing would-be terrorists of the groups' strength, durability, and thus worthiness of support," Michael S. Smith II, terrorism analyst told the publication.
"For those willing to drink that toxic cocktail, this all translates to an incredibly effective framework for inciting violence that entails the use of an authoritative figure - a caliph - and his proxies like [al-Muhajer] to command violence globally."