Homeland Security Sec. Nielsen resigns amid border turmoil

WASHINGTON -- Homeland Security Secretary Kirstjen Nielsen resigned on Sunday amid U.S. President Donald Trump's growing frustration and bitterness over the number of Central American families crossing the southern border. Trump announced  announced on Sunday in a tweet that U.S. Customs and Border Protection Commissioner Kevin McAleenan would be taking over as acting head of the department. McAleenan is a longtime border official who is well-respected by members of Congress and within the