Mattis departure leaves Trump Cabinet increasingly thin

The early departure of Defense Secretary James MattisJames Norman MattisUS could deploy 150 troops to Syria: report Trump blasts 'Mr. Tough Guy' Bolton: 'He made some very big mistakes' Congress needs to get its act together for defense funding 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 TrumpSupreme Court comes to Trump's aid on immigration Trump is failing on trade policy Trump holds call with Netanyahu to discuss possible US-Israel defense treaty 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 ZinkeThe Hill's Morning Report - Gillibrand drops out as number of debaters shrinks BLM issues final plan for reduced Utah monument New policy at Interior's in-house watchdog clamps down on interactions with press MORE and U.S. Ambassador to the United Nations Nikki HaleyNimrata (Nikki) HaleyTreasury: US deficit tops trillion in 11 months South Carolina GOP appears to violate own rules in canceling primary for Trump Politico's Johnson to become Free Beacon's new editor-in-chief 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 SessionsHouse Democrats seeking Sessions's testimony in impeachment probe McCabe's counsel presses US attorney on whether grand jury decided not to indict US attorney recommends moving forward with charges against McCabe after DOJ rejects his appeal 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 NielsenFox's Cavuto roasts Trump over criticism of network DOJ to Supreme Court: Trump decision to end DACA was lawful Top immigration aide experienced 'jolt of electricity to my soul' when Trump announced campaign 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 JohnsonDemocratic senator warns O'Rourke AR-15 pledge could haunt party for years Conservatives offer stark warning to Trump, GOP on background checks Hillicon Valley: Google to promote original reporting | Senators demand answers from Amazon on worker treatment | Lawmakers weigh response to ransomware attacks 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 SchumerSinema says she would back Kennedy in race against Markey Democrats threaten to withhold defense votes over wall Pelosi: 'People are dying' because McConnell won't bring up gun legislation 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.