Trump's twitter account isn't "PRIVATE" it's completely open to the public and nobody yet has accused him of, or shown that he's communicated any classified materials over twitter, and you are avoiding the actual question, not surprisingly!
Here's the question again for you, it's not about twitter, it's about a private email server and classified and even secret government materials.
If Donald Trump has a private email server in his bathroom at one of his retreats, and he’s been sending out sensitive classified government information on it, even secret stuff and it gets discovered by the FBI, what do you think would, could and should happen to Trump because of it?