Former GOP Virginia Senator John Warner endorses Clinton

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UNITED STATES - JANUARY 22:  Republican Senator John Warner of Virginia speaks at a news conference on Capitol Hill, Jan. 22, 2007 in Washington, D.C. A bipartisan group of U.S. senators including Warner and Susan Collins of Maine today proposed a nonbinding resolution opposing President George W. Bush's plan to send more troops to Iraq.  (Photo by Joe Marquette/Bloomberg via Getty Images)

Republican Senator John Warner of Virginia speaks at a news conference on Capitol Hill, Jan. 22, 2007 in Washington, D.C. (Photo by Joe Marquette/Bloomberg via Getty Images)

Former Sen. John Warner will endorse Hillary Clinton for president Wednesday morning, handing the Democratic nominee another high-profile Republican endorsement just 42 days before the election, CNN has learned.

Warner will join his fellow Virginian and Democratic vice presidential nominee Tim Kaine at a campaign event in Alexandria, Virginia — a state Clinton is favored to win but that Republican presidential nominee Donald Trump has been eyeing.

A Clinton campaign official, who spoke on the condition of anonymity to speak freely about the forthcoming GOP endorsement, said that Warner’s public show of support will help underscore that the former secretary of state has the temperament and experience to serve as president and head of the U.S. Armed Forces.

Warner is a former US Navy secretary, who served 30 years in the Senate, most of those in a senior position on the Armed Services Committee. Several other former high-ranking Republicans have already endorsed Clinton over Trump including diplomat John Negroponte, who served under President Ronald Reagan and President George W. Bush, and Brent Scowcroft, national security advisor under Presidents Gerald Ford and George H.W. Bush.

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