Mattis isn’t sure he can work with Bolton: report

Defense Secretary James MattisJames Norman MattisNational Guard soldiers Trump sent to border are shoveling manure, changing flat tires: report Overnight Defense: Trump explains comments on Kim's human rights record | Mattis praises Trump-Kim summit | Afghan war nominee to face Senate panel Mattis: US must 'remain vigilant' toward countries pursuing nukes MORE has told colleagues he’s unsure if he can work with John Bolton, President TrumpDonald John TrumpSunday Shows preview: Lawmakers, Trump allies discuss Russia probe, migrant family separation Seth McFarlane: Fox News makes me 'embarrassed' to work for this company  'Art of the Deal' co-author: Trump would act like Kim Jong Un if he had the same powers MORE’s new pick for national security adviser, The New York Times reported.

Mattis reportedly told staffers he would find it difficult to work with Bolton prior to Trump’s announcement last Thursday that Bolton would replace H.R. McMaster.

Bolton is said to be an unpopular pick with both Mattis and White House chief of staff John KellyJohn Francis KellyMORE.

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The president tweeted last Thursday evening that Bolton, the hawkish former George W. Bush administration official, will take over for McMaster on April 9. 

McMaster, an Army lieutenant general, will retire from the military, a White House official said.

Bolton served as U.S. ambassador to the United Nations under the Bush administration, and as undersecretary of State in the years leading up to the Iraq War, and had a focus on preventing the spread of weapons of mass destruction.

Democrats have expressed concerns about Bolton and his past pro-war views.

Bolton will be Trump's third national security adviser. His first, Michael Flynn, resigned last year and has since pleaded guilty in special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's investigation into Russian interference in the 2016 election.