A migrant from El Salvador holds a map he received from church workers at the Mexico-Guatemala border. It shows the freight train schedules and routes to the U.S. border. Carrie Kahn/NPR hide caption

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Migrants arrive at a rest stop in Ixtepec, Mexico, after a 15-hour ride atop a freight train headed north toward the U.S. border on Aug. 4. Thousands of migrants ride atop the trains, known as La Bestia, or The Beast, during their long and perilous journey through Mexico to the U.S. John Moore/Getty Images hide caption

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GOP leadership decided against keeping an immigration-related provision in the defense authorization bill. But it allowed one banning the Defense Department from participating in climate change research. Carolyn Kaster/AP hide caption

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Migrants arrive in Valletta, the Maltese capital, aboard a patrol boat on Oct. 12, a day after their boat sank, killing more than 30 people, mostly women and children — just the latest deadly migrant tragedy to hit the Mediterranean. Despite Europe's financial crisis illegal immigrants continue to attempt to enter Europe through its southern coastal countries as they seek a better life. AFP/Getty Images hide caption

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Sen. Marco Rubio, R-Fla., says talk of a bipartisan agreement among eight key senators working on immigration law is "premature." Susan Walsh/AP hide caption

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A woman takes the oath of allegiance during a naturalization ceremony at the district office of the U.S. Citizenship and Immigration Services in Newark, N.J. John Moore/Getty Images hide caption

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President Obama holds a copy of "The New Economic Patriotism: A Plan for Jobs & Middle-Class Security," which outlines some of his agenda for a second term, during a rally in Richmond, Va., on Thursday. Chip Somodevilla/Getty Images hide caption

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Texas Gov. Rick Perry speaks at a campaign event at Clark Electric Co-op on Dec. 27 in Osceola, Iowa. Perry's stance on immigration has troubled some Iowa voters. Justin Sullivan/Getty Images hide caption

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President Obama makes an economic case for immigration reform at the Chamizal National Memorial on Tuesday in El Paso, Texas. Jewel Samad/Getty Images hide caption

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