Heavyweight breaks ranks with GOP, endorsing Clinton
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Richard Armitage, who held top national security positions in the administrations of former Presidents George W. Bush and Ronald Reagan, said he would vote for presumptive Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonJuan Williams: Bush could strike blow for Biden Zuckerberg expressed concern to Trump over rhetoric amid protests: Axios Montana barrels toward blockbuster Senate fight MORE over her likely Republican rival, Donald TrumpDonald John TrumpFauci says his meetings with Trump have 'dramatically decreased' McEnany criticizes DC mayor for not imposing earlier curfew amid protests Stopping Israel's annexation is a US national security interest MORE

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"If Donald Trump is the nominee, I would vote for Hillary Clinton," Armitage, who served as a deputy secretary of State under Bush and as an assistant secretary of Defense under Reagan, told Politico on Thursday. 

"He doesn't appear to be a Republican. He doesn't appear to want to learn about the issues. So I'm going to vote for Mrs. Clinton."  

Clinton hit Trump earlier this month on national security, saying his ideas would put America in greater danger and inspire more terrorist attacks. 

"A ban on Muslims would not have stopped this attack," Clinton added on Wednesday, referring to the mass shooting at a gay nightclub in Orlando, Fla. over the weekend. 

"Neither would a wall. I don't know how one builds a wall to keep the internet out," she said. "Not one of Donald Trump's reckless ideas would have saved a single life in Orlando."

--This report was updated at 12:32 p.m.