Florida Sen. Marco Rubio, shown here at an event in Washington last month, spoke with NPR's Morning Edition about the country's economic challenges. Molly Riley/AP hide caption

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Republican Sen. Marco Rubio of Florida (left) makes remarks at CPAC 2013 on March 14. Jim DeMint (right), president of the Heritage Foundation, is shown during a news conference on immigration reform on May 6 in Washington, D.C. DPA/Landov; AP hide caption

itoggle caption DPA/Landov; AP

Sen. Charles Schumer, D-N.Y. and Sen. Marco Rubio, R-Fla., (second and third from left) announced plans to work on a bipartisan immigration proposal with their colleagues on Jan. 28 on Capitol Hill. They were also some of the first to respond to a leaked White House proposal. Alex Wong/Getty Images hide caption

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Ohio State College Republicans await Mitt Romney's son, Craig, who canvassed with them in Columbus last October. Courtesy College Republicans at The Ohio State University hide caption

itoggle caption Courtesy College Republicans at The Ohio State University

Sen. Marco Rubio, R-Fla, is among a bipartisan group of eight senators who this week announced a plan to overhaul the nation's immigration laws. Charlie Neibergall/AP hide caption

itoggle caption Charlie Neibergall/AP

Incoming Texas Sen. Ted Cruz, who spoke during the Republican National Convention this summer in Tampa, Fla., is among a number of minority politicians seen as rising stars in the GOP. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images