“On the Democrats’ side, we have a known known. On the Republican side, we have a recent entry, who’s a known unknown,” former Secretary of Defense Donald Rumsfeld said Thursday, who served under George W. Bush. He further iterates he’s “clearly going to vote” for Trump for president, calling Hillary Clinton “unacceptable.”

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He cite the reasons he found Clinton “unacceptable” for president, including her handling of the Benghazi attack in September 2012 and her use of a private email server to handle government information while serving as secretary of State. However, a Republican national security adviser just vouched their endorsement of Hillary Thursday.

Trump tweeted Thursday morning that he “very much appreciated” the support of the former Defense secretary.