The problem is, if Trump admits it, he will have to admit he is a big, giant liberal...not an anti-establishment CONSERVATIVE.
He doesn't have to admit any of that, one way or the other. And you are going to find him to be a big, giant liberal no matter what anyway.
He can come out and lie just as much as the rest of them do, and leave it to the people to figure out the truth, or trust the press (which is a really bad tool for figuring out the truth).