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 TrumpNational Archives says it altered Trump signs, other messages in Women's March photo Dems plan marathon prep for Senate trial, wary of Trump trying to 'game' the process Democratic lawmaker dismisses GOP lawsuit threat: 'Take your letter and shove it' 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 NielsenActing DHS secretary says he expects Russia to attempt to interfere in 2020 elections House Homeland Security rip DHS's 'unacceptable' failure to comply with subpoena Trump puts Kushner in charge of overseeing border wall construction: report 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.