Claire Grady, acting deputy secretary at the Department of Homeland Security (DHS), offered President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE her resignation Tuesday as the agency finds its upper ranks thinned after a string of departures.

Her exit comes after DHS Secretary Kirstjen Nielsen Kirstjen Michele NielsenDHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections Democrats smell blood with new DHS whistleblower complaint MORE announced Sunday she was leaving her post. Trump subsequently withdrew his nominee to lead Immigration and Customs Enforcement (ICE) and the White House announced that Secret Service Director Randolph "Tex" Alles would be departing the agency.

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“For the last two years, Claire has served @DHSgov w excellence and distinction. She has been an invaluable asset to DHS – a steady force and a knowledgeable voice,” Nielsen tweeted in announcing Grady’s resignation, adding it will be effective Wednesday.

“Her sound leadership and effective oversight have impacted every DHS office and employee and made us stronger as a Department. Clair has had a remarkable career in public service - 28 years at the Departments of Homeland Security & Defense - that is coming to a close. I am thankful for Claire’s expertise, dedication & friendship & am filled w gratitude for her exemplary service to DHS & to our country," she continued in a series of tweets.

Acting Deputy Secretary Claire Grady has offered the President her resignation, effective tomorrow. For the last two years, Claire has served @DHSgov w excellence and distinction. She has been an invaluable asset to DHS – a steady force and a knowledgeable voice. — Sec. Kirstjen Nielsen (@SecNielsen) April 9, 2019

Grady’s departure was expected after Nielsen’s resignation became public, though it means the department will still be without a Senate-confirmed deputy secretary as the White House works to replace the agency’s top leadership. It also clears the way for Customs and Border Protection (CBP) head Kevin McAleenan to come on as the new acting DHS secretary.

Trump is likely looking to revamp the agency into one that he believes would more effectively reduce illegal border crossings and support his hard-line immigration efforts to build more barriers at the border and curtail migrants’ prospects for asylum.

The rapid-fire departures from DHS have alarmed lawmakers on Capitol Hill, with some suggesting Trump is impeding progress on his own policies.

“The president has to have some stability and particularly with the number one issue that he’s made for his campaign, throughout his 2 1/2 years of presidency,” Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (R-Iowa) told The Washington Post on Monday. “He’s pulling the rug out from the very people that are trying to help him accomplish his goal.”