Outgoing Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenFar-left bullies resort to harassing, shaming Kyrsten Sinema — it won't work Ex-Trump official: 'No. 1 national security threat I've ever seen' is GOP Left-leaning group to track which companies hire former top Trump aides 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 TrumpYoungkin ad features mother who pushed to have 'Beloved' banned from son's curriculum White House rejects latest Trump claim of executive privilege Democrats say GOP lawmakers implicated in Jan. 6 should be expelled 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.