I'm trying to understand Sheriff Arpaio

Sheriff accuses feds of sneaking into press conference

 I'm really trying to understand this.  Sheriff Arpaio calls a press conference.  Calling a press conference is inviting the press to come to a conference.  The press has a job.  Their job is to report to the public.   In this regard, the press represents 'the public'.

Please.  Please.  Somebody explain to me how the Sheriff figgers he's having a private press conference???