Mattis departure leaves Trump Cabinet increasingly thin

The early departure of Defense Secretary James MattisJames Norman MattisThe Hill's Morning Report — Trump applauds two-year budget deal with 0 billion spending hike The Hill's Morning Report — Mueller Time: Dems, GOP ready questions for high-stakes testimony This week: Mueller dominates chaotic week on Capitol Hill MORE, which caught congressional leaders by surprise, adds to a growing number of Cabinet vacancies in the Trump administration as well as a confirmations backlog in the Senate.

President TrumpDonald John Trump5 things to know about Boris Johnson Conservatives erupt in outrage against budget deal Trump says Omar will help him win Minnesota MORE on Sunday announced he is removing Mattis, who resigned on Thursday, two months earlier than his scheduled departure at the end of February.

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Also due to depart at year’s end are Interior Secretary Ryan ZinkeRyan Keith ZinkePuerto Rican police fire tear gas at crowds protesting governor Overnight Energy: Trump officials gut DC staff for public lands agency to move West | Democrats slam EPA over scientific boards | Deepwater Horizon most litigated environmental issue of decade Trump officials gut DC staff as public lands agency preps to move out West MORE and U.S. Ambassador to the United Nations Nikki HaleyNimrata (Nikki) HaleyAmerican women can have it all State denies report ex-spokeswoman received Fox salary while in administration Trump rules out Haley joining 2020 ticket MORE.

The Senate will have to hold hearings and vote to confirm their replacements, as well as vote on William Barr, whom Trump has appointed to succeed Jeff SessionsJefferson (Jeff) Beauregard SessionsThe Hill's 12:30 Report: Trump hits media over 'send her back' coverage House gears up for Mueller testimony Trump's no racist — he's an equal opportunity offender MORE as attorney general, and Andrew Wheeler, the acting administrator of the Environmental Protection Agency, whom Trump says he plans to nominate to permanently hold the post.

The president says he will replace Haley with State Department spokeswoman Heather Nauert.

That means the Senate will be cluttered by five high-profile confirmation fights at the beginning of 2019.

A sixth confirmation battle could happen if Trump pushes out Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenTrump quietly rolled back programs to detect, combat weapons of mass destruction: report Trump's family separation policy has taken US to 'lowest depth possible,' says former immigration lawyer Four heated moments from House hearing on conditions at border facilities MORE, who has come under fire from the president.

Senate Republicans are calling on Trump to replace Mattis with a like-minded candidate, even though Mattis announced Thursday that he was stepping down from the top Pentagon post because of differences with the president over national security policy. 

“I’d like a Mattis clone. I think we all would,” Senate Homeland Security Committee Chairman Ron JohnsonRonald (Ron) Harold JohnsonMystery surrounds elusive sanctions on Russia Trump may intervene in Pentagon cloud-computing contract: report Hillicon Valley: Lawmakers struggle to understand Facebook's Libra project | EU hits Amazon with antitrust probe | New cybersecurity concerns over census | Robocall, election security bills head to House floor | Privacy questions over FaceApp MORE (R-Wis.) told reporters earlier this week. 

“This is disconcerting to say the least. We lost McMaster, we lost Kelly, we’re losing Mattis,” he added. “These are people that first of all served their country with distinction and they bring a very needed perspective into the administration,” he added, referring to former national security adviser H.R. McMaster, who left the administration in April, and outgoing White House chief of staff John KellyJohn Francis KellyMORE.

Mattis said he would leave after Trump surprised lawmakers by announcing a decision to withdraw 2,000 U.S. troops from Syria.

Brett McGurk, the special envoy for the coalition to defeat the Islamic State in Iraq and Syria, also announced his resignation Friday. 

While lawmakers aren’t grieving over the departure of Zinke, who has come under an ethical cloud related to a controversial land deal involving his family in Montana, they are uneasy about the departures of Mattis and Kelly, who were highly respected by both sides on Capitol Hill.

CNN host Jake Tapper asked Senate Foreign Relations Committee Chairman Bob CorkerRobert (Bob) Phillips CorkerTrump announces, endorses ambassador to Japan's Tennessee Senate bid Meet the key Senate player in GOP fight over Saudi Arabia Trump says he's 'very happy' some GOP senators have 'gone on to greener pastures' MORE (R-Tenn.) on Sunday about the departure of several key figures Corker once described as “those people who help separate our country from chaos."

“About three or four or five months ago I noticed a real change,” Corker said. “I think the president has felt, ‘Look, I’ve got this now.’ ” 

Corker said the president appears to be putting less value on experts such as Mattis and Kelly, citing the decision to pull out of Syria despite the advice of national security experts.

The Senate still had to act on 195 executive nominees as of a week ago, according to a tally by The Washington Post and the Partnership for Public Service.

In addition, there’s a growing backlog of judicial nominees.

There were 31 judicial nominees awaiting floor action last week, according to the Senate Judiciary Committee.

Senate leaders traditionally confirm a package of judges before wrapping up a Congress but Senate Democratic Leader Charles SchumerCharles (Chuck) Ellis SchumerOn The Money: Trump, Congress reach two-year budget, debt limit deal | What we know | Deal gets pushback from conservatives | Equifax to pay up to 0M in data breach settlement | Warren warns another 'crash' is coming Overnight Defense: Iran's spy claim adds to tensions with US | Trump, lawmakers get two-year budget deal | Trump claims he could win Afghan war in a week Trump, Democrats clinch two-year budget deal MORE (N.Y.) refused to do so this month under heavy pressure from liberal activists.

The Senate will be tied up for the first half of next year over what are likely to be controversial confirmation hearings and votes.

Republicans, however, will have some more room to confirm Trump’s nominees, as they picked up two seats and will control a 53-47 Senate majority in 2019.