A top U.S. Republican lawmaker said on Sunday he would support granting citizenship to children who are in the country illegally in a sign that conservatives who oppose immigration amnesty will be playing defense as Congress takes on immigration reform in the coming months. Representative Eric Cantor, the No. 2 Republican in the House of Representatives, said Congress could make quick progress on immigration if lawmakers agreed to give citizenship to children - an idea he opposed when it came up for a vote in 2010 as the DREAM Act. "The best place to begin, I think, is with the...