White House chief of staff John Kelly John 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 Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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 Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections 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.