President Trump said Homeland Security Secretary Kirstjen Nielsen is leaving her job amid growing frustration by the administration over the number of southern border crossings. McAleenan is a longtime border official who is well-respected by members of Congress and within the administration.
But privately, she had grown increasingly frustrated by what she saw as a lack of support from other departments and increased meddling by Trump aides, the people said.
Kirsten Nielsen, the embattled homeland security secretary who over the past year has acted as the public face of some of the Trump administration's most contentious policies, has resigned.
Nielsen, a former George W. Bush White House staffer, began her path in the Trump administration as DHS chief of staff, where she formed a close working relationship with then-DHS Secretary John Kelly.
According to CBS News, which first reported the news, Nielsen's departure was yet another victory for Stephen Miller, the far-right senior adviser in the White House who has consistently steered the president in a hardline direction on immigration.
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There have been persistent tensions between the White House and Nielsen nearly from the moment she became secretary, after her predecessor John Kelly became the White House chief of staff in 2017.
But at the agency that oversees border protection and immigration matters - Trump's signature issue - it was inevitable Nielsen would find herself within the President's crosshairs. She had expected to be pushed out last November, but her exit never materialized. The Wall Street Journal reported in November that Trump had chose to replace Ms Nielsen.
But her standing with President Donald Trump was shaky from the outset, and Trump began blaming her when illegal migration rebounded at the southern border. She was tasked with helping states secure elections following Russian interference during the 2016 election. She was heckled in restaurants as the policy came under criticism.
He recently threatened to close the border, or parts of it, if Congress did not change USA laws to fix what he called immigration "loopholes".