When there are things like laws that say "Inspectors general can only be fired after 30 days notice to Congress, and for-cause, which reason must be provided to Congress" it's not exactly a leap to say it's illegal when a president summarily fires a whole bunch of them effective immediately for vague reasons with no notice to Congress. For example.

[EDIT] Bluntly, if you think that was some kind of slanted or out-there take, you aren't paying nearly enough attention.