except his supporters won't know about it since he is censored.

The president can't be easily muted in the same way that a non-famous person could. Good or bad, the press will parrot what he says, in any forum.

The President can call a press conference at any moment that will get coverage from pretty much every national media outlet, especially any outlet likely to be frequented by his supporters. Presidents will never be without a method to communicate with their supporters.