More than half of Congress has turned over since the last time the House and Senate tried to move legislation to overhaul the nation’s immigration laws.

The high turnover rate bolsters the argument of Republican leaders, who say Congress must move methodically on immigration. President Obama, meanwhile, has pushed for swift passage of a bill, saying lawmakers have long debated the issue.

Only 54 current senators were in the Senate in June of 2007, when the upper chamber last voted on comprehensive immigration and border-security legislation. And just five of the 23 GOP senators who voted in favor of the 2006 immigration reform bill are still serving: Sens. Lindsey Graham (S.C.), John McCain (Ariz.), Susan Collins (Maine), Lisa Murkowski (Alaska) and Mitch McConnell (Ky.).

In the House, the turnover has been higher since the lower chamber last cast a major vote on immigration at the end of 2005.

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