Ronald Reagan's son: I won't vote for Trump in primary
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President Ronald Reagan's son said he doesn't plan to vote for presumptive GOP presidential nominee Donald TrumpDonald John TrumpTrump watching 'very closely' as Portland braces for dueling protests WaPo calls Trump admin 'another threat' to endangered species Are Democrats turning Trump-like? MORE in Tuesday's California primary.

"I will not be Voting for Trump tomorrow in the Calif.Primary.." Michael Reagan tweeted on Monday.

"This most likely would be the 1st time if my father was alive that he would not support the nominee of the GOP," he added in a subsequent tweet in which he tagged Republican National Committee Chairman Reince Priebus.

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Michael Reagan has in the past hit at Trump.

"Trump Republicans bash everyone in the building and blow it up on the way out," he told Politico last year, before Trump had become the GOP's presumptive nominee.

“Ronald Reagan rebuilds the building as he goes through it,” he added. “What about the 11th Commandment? Thou shall not speak ill of another Republican. I guess there’s a 12th: Thou shall speak ill of everybody.”

His brother, Ron Reagan, has also said he has negative opinions of Trump.

Michael Reagan joins several other Republican leaders who have said they will not support Trump, incluidng Mitt Romney, the 2012 GOP nominee, and Jeb Bush, a former Florida governor who ran unsuccessfully for the 2016 Republican presidential nomination.