Have you seen anything from POTUS as to WHY they fired 17 IGs?

Asking literally as I cannot find any news source or statement on this that isn't focused on the legality.

The two high level possibilities as I see it: 1) Trump desires more oversight, so wants people in these positions that are more effective 2) Trump wants less oversight, so he's removed people that provide oversight

Does anyone know which one is true, or if there is some other reason?