John Kelly called White House 'miserable place to work': report

White House chief of staff John KellyJohn Francis KellyMORE, burned out by his job, is reportedly questioning how long he can remain in the post.

The chief of staff told a group of senators last week that the White House is “a miserable place to work,” The New York Times reported Sunday.

According to the Times, aides are mocking Kelly’s new deputy chief of staff, Zachary Fuentes, by calling him “deputy president” for taking over some of Kelly’s duties.

President TrumpDonald John TrumpDemocratic senator rips Trump's 'let them fight' remarks: 'Enough is enough' Warren warns Facebook may help reelect Trump 'and profit off of it' Trump touts Turkey cease-fire: 'Sometimes you have to let them fight' MORE, however, isn't concerned by the possible turnover in his administration and is comfortable with removing aides who challenge him, the paper reported.

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Kelly joined the White House last year, looking to bring calm to an administration often described as chaotic.

However, sources told The Hill earlier this year that Kelly has lost influence over Trump in the months since his arrival.

The chief of staff also reportedly erupted at Trump in March, threatening to quit. Other officials, including Homeland Security Secretary Kirstjen NielsenKirstjen Michele NielsenTrump confirms Rick Perry to step down as Energy secretary Trump says acting Homeland Security chief McAleenan will step down Activists to demonstrate at ICE headquarters after Cameroonian immigrant dies in custody MORE, calmed Kelly down.

Kelly has reportedly threatened to quit in the past as a way of exerting leverage over Trump.

Kelly is currently accompanying Trump in Singapore ahead of the president's summit with North Korean leader Kim Jong Un.