On Sunday, Trump countered those who question his Republican bona fides by invoking Ronald Reagan.
"Well, you know, you could say that about Ronald Reagan, because Ronald Reagan was a Democrat with a very, very liberal lean. And he actually became Republican who was fairly conservative. I wouldn't say he was the most conservative, but fairly," Trump said. "And he talked about he evolved as he got older. And I have also. And don't forget, I—when you label me—I was never a politician.