Guess you wouldn’t have trusted Reagan - a former Democrat, union leader, pro-choice guy at one time in his life.
By 1980 Reagan had proven his Conservatism in his two terms as Governor. A lot of folks who were Democrats in 30’s and 50’s became Republicans in the 60’s.
Trump was a Democrat as early as 2009. He had donated to Hillary in 2000 and 2006.
I accept he is probably going to be the nominee. I accept I will have to hold my nose and vote for him in the general election as I did with McCain and Romney. But I will not trust him.