Homeland Security Secretary Kirstjen Nielsen resigned, according to a Sunday evening tweet by President Donald Trump. At the same time, the president announced that Kevin McAleenan, the commissioner of U.S. Customs and Border Protection, will become Acting Secretary of Homeland Security.

….I am pleased to announce that Kevin McAleenan, the current U.S. Customs and Border Protection Commissioner, will become Acting Secretary for @DHSgov. I have confidence that Kevin will do a great job!

— Donald J. Trump (@realDonaldTrump) April 7, 2019

Nielsen, who has been secretary since December 2017, presided over the mass detention of migrants found coming across the U.S.-Mexico border. During her tenure, two children died while being held in detention centers. Before the deaths, a child had not died

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