Lawyer George ConwayGeorge Thomas ConwayGeorge and Kellyanne Conway honor Ginsburg Lincoln Project releases new ad blasting Trump as 'a horrible role model' George Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' MORE ripped President TrumpDonald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Monday, saying he “incompetently botched” picking a successor for departing 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.

In several posts on Twitter, Conway, the husband of White House counselor Kellyanne ConwayKellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE, knocked Trump and the administration and said they were not prepared for Nielsen’s exit, which was announced Sunday.

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“Her letter said ‘effective April 7’—yesterday,” George Conway wrote. “They must have realized late last night how Trump incompetently botched the naming of her successor without having someone check the statute. But was the resignation letter accepted?”

His post quoted a tweet from Nielsen that said she would be staying at the Department of Homeland Security (DHS) through Wednesday to “assist with 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 DHS missions are not impacted," Nielsen tweeted Sunday night, just hours after Trump announced her departure.

Trump also tweeted on Sunday that Kevin McAleenan, the commissioner of Customs and Border Protection, would lead the department on an acting basis until a permanent replacement is chosen.

Conway on Monday also compared Nielsen’s resignation letter to former Defense Secretary James MattisJames Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE's, noting that neither named Trump specifically.

Conway has been a vocal and consistent critic of Trump’s, leading to several Twitter feuds and public battles between the two.

In another early morning post, Conway continued his attack on Trump, writing, "We don't really have a president."