Prove that he is capable of doing the job and find some way to at least partially repair his image with minorities. It's a tough task but not impossible. Also the trump is hitler thing has gotten so old it's such an ignorant thing to say.
It may only be ignorant for now. I have no clue how he'd do as president if our country was sorry enough to vote him in. I wouldn't be surprised if he was like him.
We must not forget about the hatred, racism, bigotry and xenophobia that is part of trump's campaign.
It was said best when during a rally against Little-Hands-Drumpf-Fuhrer, a protester was holding this sign .....