Marco Rubio

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Sen. Marco Rubio, Florida Republican, speaks June 22, 2012, at the NALEO (National Association of Latino Elected and Appointed Officials) conference in Lake Buena Vista, Fla. (Associated Press)

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Marco Rubio

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Republican presidential candidate Mitt Romney (right), campaigning with Sen. Marco Rubio of Florida, talks to reporters in Aston, Pa., in April 2012. (Associated Press) ** FILE **

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Florida Sen. Marco Rubio speaks June 21, 2012, to reporters at a breakfast hosted by the Christian Science Monitor. (Michael Bonfigli/Christian Science Monitor)

**FILE** Florida Sen. Marco Rubio answers a question June 4, 2012, during a brief press conference following a roundtable luncheon hosted by the Indiana Republican party in Merrillville, Ind. (Associated Press/The Post-Tribune)

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Sen. Marco Rubio (left), Florida Republican, endorses Virginia Republican George Allen (right) for the U.S. Senate at a press conference at Company Flowers, a family-owned small business, in Arlington on Thursday, June 14, 2012. (Andrew Harnik/The Washington Times)

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Sen. Marco Rubio, Florida Republican, has said he does not expect to be on the GOP ticket this year, but he has campaigned with the likely nominee. (Associated Press)

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Sen. Marco Rubio, Florida Republican, speaks Tuesday on Capitol Hill about Startup Act 2.0, a bipartisan effort aimed at jump-starting the economy by making more visas available for immigrants with advanced degrees and those wishing to start businesses. Behind him are (from left) Sen. Mark R. Warner, Virginia Democrat; Internet entrepreneur Steve Case, a member of President Obama's Council on Jobs and Competitiveness; Sen. Jerry Moran, Kansas Republican, and Sen. Christopher A. Coons, Delaware Democrat. (Associated Press)

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Sen. Marco Rubio of Florida (right) talks about his views on foreign policy at the Brookings Institution in Washington on Wednesday. He is joined by Marvin Kalb (left), a Brookings guest scholar, and Sen. Joe Lieberman, a Democrat-turned-independent from Connecticut. He discussed his views on Iran and Syria. (Associated Press)