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In page Political positions of the Republican Party (United States):

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Republicans are divided on how to confront illegal immigration between a platform that allows for migrant workers and easing citizenship guidelines, and border enforcement-first approach. In general, pro-growth advocates within the Republican Party and it support more immigration, and traditional or populist conservatives oppose it.[citation needed] In 2006, the White House supported and Republican-led Senate passed comprehensive immigration reform that would eventually allow millions of illegal immigrants to become citizens, but the House, also led by Republicans, took an enforcement-first approach, and the bill failed to pass the conference committee.[1]