"She leaves behind a troubled legacy at the Department of Homeland Security".
Nielsen had grown frustrated by what she saw as a lack of support from other departments and meddling by Trump aides on hard immigration issues, according to three people familiar with details of her resignation.
Trump broke the news Sunday that Nielsen would be leaving the administration after reports described the president growing increasingly frustrated with the situation at the border. Both Nielsen and Alles were closely associated with former White House chief of staff John Kelly, who resigned previous year after falling out of favor with Trump.
Ms Nielsen had not only aroused the ire of Mr Trump, but also Stephen Miller, the president's hardline immigration adviser.
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"There is a near-systematic purge happening at the nation's second-largest national security agency", one administration official said. Eastern time, Nielsen tweeted again, this time stating that she has "agreed to stay on as Secretary through Wednesday, April 10th to assist with an orderly transition and ensure that key DHS missions are not impacted".
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Mr Trump said Kevin McAleenan, the current US Customs and Border Protection Commissioner, will become acting secretary. Embassy in Israel from Tel Aviv to Jerusalem and recognize Israeli sovereignty over the Golan Heights.
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Poverty and gang violence in Honduras, Guatemala and El Salvador is largely responsible for the exodus. Customs and Border Protection Commissioner Kevin McAleenan has taken over as department head.
"Nobody ever said I was cleaning house", Trump told reporters at the White House.
One individual changing her tone or sending Nielsen the slightest semblance of praise happens to be Minnesota Rep. Ilhan Omar, who has also not been one to hold her tongue on social media. Luckily, "now that she's out, Stephen Miller can go back to making people uncomfortable all by himself", Colbert said. The administration is allowed to separate children under certain circumstances including the health and welfare of the child and a parent's criminal history; this is why children were separated under Obama. By that night, murmurs were swirling that Vitiello's removal wasn't a one-off and that Miller was orchestrating a wholesale leadership overhaul of her department. "She got caught up in President Trump's anti-immigration machine".
Both US and global law prohibit the US from refusing entry to people who are in danger of prosecution in their home countries; both US statute and court settlements offer extra due-process protections to asylum seekers, children, and families.
"I will continue to support all efforts to address the humanitarian and security crisis", she said, thanking the president "for the tremendous opportunity to serve this country".
Standing outside her home in Alexandria, Virginia, on Monday, Nielsen sounded just as loyal to Trump as she had at the border.
Last Friday, the President visited Calexico, California, where he said, "We're full, our system's full, our country's full - can't come in!"
Mark Morgan, a former Federal Bureau of Investigation official who served as chief of Border Patrol under President Barack Obama, said White House officials "need to stop expecting that Congress is going to do their job" and reform immigration laws.
The sources told CNN the president also wanted families separated even if they were apprehended within the US, in order to deter other migrants from entering.