@benji and Marrec
of course the president has the ability to hire and fire the FBI directory. That is not at issue here. Its the optics of it. It doesnt look good, at all, when the person investigating someone else is fired by that someone else. If you can't see how that isn't exactly a good look, I dont know what to tell you. Also, they can say it was because of the way he handled Hillary's email probe, but last year Trump was praising Comey's investigation.
Its also never happened before, without an investigation.