Mitt Romney actually said...

I just can't bring myself to vote for Hillary Clinton. I don't think the policies that she promotes are right for the country, and Mr. Trump...

I think he has calculated he could get support even if he shot someone, but if he released his taxes, he would lose support.

I wish there had been somebody that stopped Mr. Trump, had I been in the race, I can assure you, I would have taken him on.

There's no question in my mind, he will never release his tax returns.