Marco Rubio

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio (R-Fla.) speaks at this year's Conservative Political Action Conference (C.P.A.C.) held at the Gaylord National Hotel, National Harbor, Md., Thursday, March 14, 2013. (Andrew Harnik/The Washington Times)

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** FILE ** Sen. Marco Rubio, Florida Republican, speaks at the 40th annual Conservative Political Action Conference in National Harbor, Md., on March 14, 2013. (Associated Press)

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Sen. Marco Rubio, Florida Republican and member of the Senate Intelligence Committee, questions of a witness during the committee's hearing on worldwide threats on March 12, 2013, on Capitol Hill in Washington. (Associated Press)

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Sen. Marco Rubio, Florida Republican, is advocating a more muscular brand of global leadership and observers said it is significant that he tapped Jamie Fly, an adviser to former President George W. Bush, as a counselor on foreign affairs and national security. (Associated Press)

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**FILE** Sen. Marco Rubio, Florida Republican, speaks during a meeting with Israel's President Shimon Peres in the President's residence in Jerusalem on Feb. 20, 2013. (Associated Press)

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Israeli President Shimon Peres (right) speaks with Sen. Marco Rubio, Florida Republican, in Jerusalem on Wednesday. The swing through the Middle East is bolstering Mr. Rubio’s experience in foreign policy. (Associated Press)