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 TrumpTrump rallies in Nevada amid Supreme Court flurry: 'We're gonna get Brett' Trump: 'Good news' that Obama is campaigning again Trump boosts Heller, hammers 'Wacky Jacky' opponent in Nevada 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 NielsenUS to prioritize attacks against foreign adversaries under new cyber strategy Paddlers sue Trump over frequent golf visits shutting down the Potomac River FEMA administrator nearly quit amid feud with DHS chief: 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.