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FILE - In this Jan. 28, 2013, photo, Sen. Marco Rubio, R-Fla., right, and Sen. Charles Schumer, D-N.Y., left, join a bipartisan group of leading senators to announce that they have reached agreement on the principles of sweeping legislation to rewrite the nation's immigration laws at the Capitol in Washington. Rubio, a leading proponent of overhauling the immigration system who has gained attention in GOP circles, will deliver the Republican response to President Barack Obama's State of the Union address on Tuesday. (AP Photo/J. Scott Applewhite)

Associated Press
FILE - In this Jan. 28, 2013, photo, Sen. Marco Rubio, R-Fla., right, and Sen. Charles Schumer, D-N.Y., left, join a bipartisan group of leading senators to announce that they have reached agreement on the principles of sweeping legislation to rewrite the nation's immigration laws at the Capitol in Washington. Rubio, a leading proponent of overhauling the immigration system who has gained attention in GOP circles, will deliver the Republican response to President Barack Obama's State of the Union address on Tuesday. (AP Photo/J. Scott Applewhite)
FILE - In this Jan. 28, 2013, photo, Sen. Marco Rubio, R-Fla., right, and Sen. Charles Schumer, D-N.Y., left, join a bipartisan group of leading senators to announce that they have reached agreement on the principles of sweeping legislation to rewrite the nation's immigration laws at the Capitol in Washington. Rubio, a leading proponent of overhauling the immigration system who has gained attention in GOP circles, will deliver the Republican response to President Barack Obama's State of the Union address on Tuesday. (AP Photo/J. Scott Applewhite)
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