No no no.

As a political office holder, he is not a private citizen. His speech is by definition government speech. Attempting to force private entities to broadcast government speech is...precisely the opposite of censorship.

With what? He violated the TOS, and as a private citizen (or Commander in Chief, for that matter) he is not above the arbitration of digital contracts. There's no way this case isn't instantly thrown out, provided the judge has even a cursory familiarity with software licensing.