Outgoing Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE said Sunday she would be staying on until Wednesday, April 10, to ensure an "orderly transition."

"I have agreed to stay on as Secretary through Wednesday, April 10th to assist with an orderly transition and ensure that key [Department of Homeland Security] DHS missions are not impacted," Nielsen tweeted hours after President TrumpDonald John TrumpNew Biden campaign ad jabs at Trump's reported 0 income tax payments Ocasio-Cortez: Trump contributed less in taxes 'than waitresses and undocumented immigrants' Third judge orders Postal Service to halt delivery cuts MORE announced her departure from the agency.

Trump announced on Twitter earlier Sunday that Nielsen would be leaving her role at DHS, where she implemented the president’s hard-line immigration policies.

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Trump tweeted that Kevin McAleenan, the commissioner of Customs and Border Protection, will lead the DHS on an acting basis.

In her resignation note earlier Sunday, Nielsen had said her departure from the agency was effective April 7.

The White House did not immediately respond to a request to explain the change in Nielsen's departure date.