Mattis departure leaves Trump Cabinet increasingly thin

The early departure of Defense Secretary James MattisJames Norman MattisNew 2020 candidate Moulton on hypothetical Mars invasion: 'I would not build a wall' Trump learns to love acting officials Shanahan says he's 'never favored' Boeing as acting Defense chief 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 TrumpDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Post-Mueller, Trump has a good story to tell for 2020 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 ZinkeOvernight Energy: Trump moves to crack down on Iranian oil exports | Florida lawmakers offer bill to ban drilling off state's coast | Bloomberg donates .5M to Paris deal Florida lawmakers offer bill to ban drilling off state's coast Overnight Energy: Gillibrand offers bill to ban pesticide from school lunches | Interior secretary met tribal lawyer tied to Zinke casino dispute | Critics say EPA rule could reintroduce asbestos use MORE and U.S. Ambassador to the United Nations Nikki HaleyNimrata (Nikki) HaleyPollster says Trump unlikely to face 'significant' primary challenge Trump blocked renomination of Obama-era UN racism official, won't pick a replacement: report Trump says he considered nominating Ivanka to lead World Bank 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 SessionsTrump poised to roll back transgender health protections Trump claims Mueller didn't speak to those 'closest' to him And the winner of the Robert Mueller Sweepstakes is — Vladimir Putin 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 NielsenNielsen was warned not to talk to Trump about new Russian election interference: report DHS head: Separating migrant families 'not on the table' Trump moves to crack down on visa overstays 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 JohnsonGOP senator: 'No problem' with Mueller testifying The Hill's Morning Report — Category 5 Mueller storm to hit today GOP senators double down on demand for Clinton email probe documents 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 CorkerEx-GOP Sen. Corker: Trump primary would be 'good thing for our country' Pollster says Trump unlikely to face 'significant' primary challenge GOP gets used to saying 'no' to Trump 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 SchumerMJ Hegar announces Texas Senate bid Hillicon Valley: House Dems subpoena full Mueller report | DOJ pushes back at 'premature' subpoena | Dems reject offer to view report with fewer redactions | Trump camp runs Facebook ads about Mueller report | Uber gets B for self-driving cars Dem legal analyst says media 'overplayed' hand in Mueller coverage 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.