Debate Techniques

demonizing the press - characterizing the press as the enemy, politically motivated, and dishonest.

A form of poisoning the wellsee definition - discrediting your opponent to an audience in advance, in order to encourage dismissing any future claims or accusations they may make against you.
, since if the press is perceived as an enemy, any and all scrutiny from it can be just characterized as bias, and attacking the press can then seem reasonable, justified, or even admirable.