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U.S. Sen. Bob Corker (R-Tenn), chairman of the Senate Committee on Foreign Relations, at a hearing considering the nomination of Rex Tillerson as Secretary of State on Jan. 11, 2017 in Washington, D.C. Corker said he stands by his comments that Donald Trump hasn't shown the stability or competency to succeed as president. (Ron Sachs/CNP/Sipa USA/TNS)

U.S. Sen. Bob Corker (R-Tenn), chairman of the Senate Committee on Foreign Relations, at a hearing considering the nomination of Rex Tillerson as Secretary of State on Jan. 11, 2017 in Washington, D.C. Corker said he stands by his comments that Donald Trump hasn't shown the stability or competency to succeed as president. (Ron Sachs/CNP/Sipa USA/TNS)