Ted Cruz steps up Republican war over immigration by promising refugee background checks
Republican Presidential candidate Sen. Ted Cruz, R-Texas, campaigns at Penny's Diner in Missouri Valley, Iowa, Monday, Jan. 4, 2016. (AP Photo/Nati Harnik)

If Donald Trump thinks that America’s doors should be closed to Muslim refugees, his main rival is dubious about those who are already here. Senator Ted Cruz has tried to…

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