In fairness, and it is rather lengthy, here is Trump's record (you can check what issues you want using other information and websites) and he is considered a "hard core conservative".
He is by no means a fiscal conservative and it is troubling that he is trying to smear a very conservative governor. DeSantis obviously is a huge threat because he rules conservatively, his reputation is that of a conservative and his accomplishments as governor continue.
Trump's past haunts him. Trump has voted liberal,aligned himself with the Clintons and Epstein, he was pro-choice, he was soft on the 2A. His liberal roots are what they are and his NY values are questionable. He has a reputation of being nasty, bullying, grabbing women and that is something that he can't erase. He is a fool to believe that he can bully this time around and win the GOP nomination and capture the WH.
https://www.ontheissues.org/donald_trump.htm