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John W. Warner, a Republican who represented Virginia in the U.S. Senate for 30 years, will endorse Democrat Hillary Clinton for president today.

Sen. Tim Kaine of Virginia, the Democratic nominee for vice president, will appear with Warner in Alexandria for the announcement.

Clinton said in a statement on Tuesday night:

“For 30 years, Virginians trusted John Warner in the Senate, and for good reason: He has dedicated his life to defending our country, from serving in the Navy in World War II to chairing the Senate Armed Services Committee, where I had the honor of working with him to support our men and women in uniform and their families.

“I am proud to have John’s support, and to know that someone with his decades of experience would trust me with the weighty responsibility of being commander in chief.”

Warner, 89, who represented Virginia in the U.S. Senate from 1979 to 2009, has split with his party in the past.

For instance, he voted against President Ronald Reagan’s nomination of Robert Bork to the U.S. Supreme Court in 1987 and he declined to support Republican nominee Oliver North for the U.S. Senate in 1994, instead backing the independent candidacy of J. Marshall Coleman.