Washington • Homeland Security Secretary Kirstjen Nielsen resigned on Sunday amid the administration’s growing frustration and bitterness over the number of Central American families crossing the southern border, two people familiar with the decision said.
President Donald Trump thanked her for her work in a tweet and announced 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 administration. The decision to name an immigration officer to the post reflects Trump's priority for a sprawling department founded to combat terrorism following the Sept.