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By David Lawder and Richard Cowan WASHINGTON (Reuters) - Republicans in the U.S. House of Representatives voted on Friday to crack down on Central American migrants, including unaccompanied children, who are flooding to the U.S. border with Mexico, as lawmakers passed a $694 million border security bill. The 223-189 vote came one day after conservative Republicans balked at an earlier version of the measure, exposing a deep rift between Tea Party activists and more mainstream Republicans. In passing the retooled bill, the Republican-led House ignored a veto threat from the White House. "We couldn't go home (for recess) and not have a decision," said Representative Kay Granger of Texas, who helped draft the original bill.