Does the leader of your country have the 'absolute right' to control the Justice Department of your country?

In fact Our Liar in Chief actually doesn't have a clue what government is--or how it works. Easy to tell that by how he comes out publically to declare so and so "Guilty, should be convicted"--to various people so far. That biases juries--is NOT the function of a prez and in every case he's done so--Berghdahl for an example--the courts end up slapping the person on trial on the wrist because the defense in every case has filed an immediately appeal to dismiss based on jury biasing. From watching how can't do much more than play golf--and sign EO's--which are meaningless in terms of "legislation"----he can't handle his own job. 9/10 of those are dismissed as being unconstitutional---which shows he has no clue what is legal and what what isn't under the Constitution---so if he has no clue how to do his own job----why would he think he can handle every other department of government's job?