There she echoed Trump's comments on the situation at the border, though she ducked out of the room without explanation for some time while Trump spoke.
Kirstjen Nielsen's abrupt departure as secretary of the Department of Homeland Security (DHS) comes as President Trump seeks to steer his administration towards a "tougher" approach on immigration to confront a surge in migrant families heading to the U.S. Most recently, Mr. Trump had been asking Ms. Nielsen to close the borders and prevent people from seeking asylum.
Often the primary person working to turn Trump's harsh immigration rhetoric into policy, Nielsen has faced intense scrutiny. A senior administration official said Trump asked for Nielsen's resignation and she gave it.
Nielsen was confirmed by the Senate in December of 2017, after John Kelly left the position to serve as Trump's chief of staff. Nielsen faced more public pressure after the Trump administration enacted a policy of family separation that resulted in thousands of migrant children being separated from their parents, which the president ultimately reversed.
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House Homeland Security Committee Chairman Bennie Thompson, D-Miss., said her tenure was "a disaster from the start".
But by October of that year she was back at DHS, this time as secretary. Nielsen's departure also means acting heads will soon be running DHS, the Pentagon, and the U.S. Department of the Interior.
That said, she was prepared to be fired at any moment, but did not know going into Sunday's meeting it would be imminent.
Nielsen isn't the only administration official impacted by the apparent overhaul: On Friday, Trump announced he was pulling his nominee to lead U.S. Immigration and Customs Enforcement, the Associated Press reported. On a number of occasions, she indicated she didn't believe the Russians specifically tried to help Trump, despite intelligence community conclusions that they did.
Images of sobbing children being taken from their parents a year ago fuelled a national outcry that saw Democrats demand she resign, as condemnation poured in from the United Nations, human rights groups, and four former first ladies - all mothers - who called the policy "cruel" and "immoral". CBS says the move is "orchestrated" and "engineered" by White House adviser Stephen Miller, who has encouraged Trump to take a very tough life in illIegal immigration.