Kelly, people around him say, no longer works to keep his mercurial boss on task or on message, with a Republican close to the White House referring to him as a "chief of staff in name only".
A retired Marine general, Kelly replaced Reince Priebus in the role.
About a year later, Kelly is nearly useless, having lost respect among staffers and exerting little control over Trump's impulsive agenda, decisions, and tweeting. Mr. Trump tweeted Monday. At the president's request and Kelly's acceptance, Kelly would not be leaving this summer as some initially speculated. The Washington Post reports that both men were in the room and "listened quietly" when Kelly made his announcement.
"We didn't cover ourselves in glory", Kelly told a gathering of reporters last March.
Trump and Kelly have privately argued at times and complained about one another to confidants. But he has often found himself at the center of the myriad controversies that have embroiled the Trump administration.
"Congratulations to General John Kelly".
Trump has reportedly considered replacing Kelly with Nick Ayers, Vice President Mike Pence's longtime aide and chief of staff, and Mick Mulvaney, the Office of Management and Budget chief who also serves as acting director of the Consumer Financial Protection Bureau.
Kelly's allies have said he took the job out of a sense of duty and he has not exactly hidden his simmering dissatisfaction.
Kelly did manage to cut off "meeting crashers", uninvited West Wing aides who used to show up to meetings, Politico reported, but he has not been able to control the president's habit of using his favorite network, Fox News, to dictate his agenda.
But Trump has chose to stick with Kelly - for now, at least. But he added: "Look, at some point, things happen but I will tell you. we have a very good relationship".