By SONIA PEREZ D., PETER ORSI and MARK STEVENSON Associated Press
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GUATEMALA CITY — As some 3,000 Hondurans made their way through Guatemala, attention turned to Mexico, after U.S. President Donald Trump threatened Thursday to close the U.S.-Mexico border if authorities there fail to stop them — a nearly unthinkable move that would disrupt hundreds of thousands of legal freight, vehicle and pedestrian crossings each day.