Sen. Mitt Romney Willard (Mitt) Mitt RomneySenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Utah) on Tuesday called vacancies at the Department of Homeland Security (DHS) "dangerous" and "seriously troubling."

Romney made the comments during a hearing of the Homeland Security Committee two days after 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 announced the departure of Homeland Security 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.

"It is dangerous, given what’s happening at the border, dangerous given the broad responsibility that the Department of Homeland Security has for protecting our nation," Romney said. "It is seriously troubling."

I am deeply troubled by the vacancies at @DHSgov. It is dangerous given what’s happening at the border and dangerous given the broad responsibility that the Department of Homeland Security has for protecting our nation. pic.twitter.com/jtK9GF28YU — Senator Mitt Romney (@SenatorRomney) April 9, 2019

In the past four days, Trump has withdrawn his pick to lead Immigration and Customs Enforcement (ICE), announced Nielsen's resignation and ousted the head of the Secret Service.

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Romney's condemnation of the vacancies follows a day after Senate Homeland Security Committee Chairman Ron Johnson Ronald (Ron) Harold Johnson CIA found Putin 'probably directing' campaign against Biden: report This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda GOP set to release controversial Biden report MORE (R-Wis.) said he was concerned about a "growing leadership void" at DHS amid talks of a shake-up of top staffers.

"I am concerned with a growing leadership void within the department tasked with addressing some of the most significant problems facing the nation," Johnson said in a statement.

White House adviser Stephen Miller is reportedly pushing for the removal of others at DHS, including Lee Cissna, the director of United States Citizenship and Immigration Services (USCIS), and the department's general counsel John Mitnick, CNN reported Monday.

Trump tweeted Sunday that Nielsen would be leaving her position and that Customs and Border Protection Commissioner Kevin McAleenan would temporarily replace her until someone is chosen to permanently fill the role.