CBS News was the first to report that Nielsen would resign, and attributed the decision to adviser Stephen Miller and an "overhaul" of all things immigration on his part.
On Sunday afternoon, President Donald Trump announced that Homeland Security (DHS) Secretary Kirstjen Nielsen will resign, and the current U.S. Customs and Border Protection commissioner will take her place.
Nielsen has faced a great deal of harassment as DHS secretary.
Before she was nominated as secretary, Nielsen worked as a deputy to former Marine General John Kelly, who headed DHS before becoming White House chief of staff.
The 46-year-old's departure marks the end of a tortured relationship with her boss, who blamed her for a recent spike in the number of migrants coming through the Mexico border and reportedly felt she wasn't tough enough to implement his policies.
CBS had reported Sunday, citing a senior US official, that the overhaul of Homeland Security and its subsidiary agencies such as ICE is being orchestrated by top Trump adviser Stephen Miller.
"When you put all of the facts together, the problem is not just the vastly increasing numbers ... but [also] the type of migrant that our system is not set up to protect", Nielsen said.
Nielsen was allegedly scheduled to talk to the president about immigration and border issues. Nielsen was seen as Kelly's protegee. She had expected to be pushed out last November, but her exit never materialized.
She was confirmed as DHS secretary on December 6, 2017. McAleenan also has a reputation within CBP as a "brilliant" mind with "tremendous organizational skills". McAleenan is a longtime border officer, reflecting Trump's priority for the department initially founded to combat terrorism after the September 11 attacks.
Trump is shaking up the whole agency, saying on April 5 that he intends to replace Ron Vitiello, his nomination to lead Immigration and Customs Enforcement (ICE), because the agency is "going in a little different direction".
The second step was asking for Nielsen's resignation.
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