Acting Homeland Security Secretary Kevin McAleenan threatened to leave his post after President Trump's senior adviser Stephen Miller tried to dictate agency hiring, administration officials said. McAleenan blocked Miller's attempts, but he reportedly made known that he needed to have more control over his agency. The dispute revolved around former FBI official Mark Morgan, whom Trump selected to be the new director of Immigration and Customs Enforcement. Miller, though, sought to have Morgan installed as the commissioner of Customs and Border Protection instead. But McAleenan made clear to White House officials that he, not Miller, was the head of the DHS in closed-door meetings. McAleenan ultimately prevailed and Morgan will take over as acting ICE director next week.

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