Marco Rubio

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Sen. Marco Rubio, (R-Fla.) arrives before speaking at an event entitled, "Strong Values for a Strong America" focusing on America's family issues at the Edward J. Pryzbyla University Center at Catholic University, Washington, D.C., Wednesday, July 23, 2014. (Andrew Harnik/The Washington Times)

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"What I think would have prevented that from happening is sufficient border security on the ground," Sen. Marco Rubio says. (Associated Press)

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Sen. Marco Rubio of Florida favors a more aggressive U.S. military campaign to combat Islamic militants in Iraq. (Associated Press)

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FILE - In this June 19, 2014, file photo, Sen. Marco Rubio, R-Fla. speaks at the Faith and Freedom Coalition's Road to Majority event in Washington. Rubio hopes everyone’s summer is off to a good start. Please send money. Welcome to the unending, inbox-clogging world of online campaign fundraising, set against a backdrop of a June 30 Federal Election Commission deadline for candidates to disclose their campaign finances. (AP Photo/Molly Riley, File)

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Young supporters listen as Sen. Marco Rubio (R-Fla.) campaigns with Republican gubernatorial candidate for Virginia Governor Ken Cuccinelli the day before election day at a campaign stop, Warrenton, Va., Monday, November 4, 2013. (Andrew Harnik/The Washington Times)