Is President Trump's chief of staff leaving his job? Not if he has anything to say about it.

John Kelly sought to quash rumors of his dissatisfaction with his White House role at Thursday's press briefing. 

"I read it all the time pretty consistently, (but) I am not quitting today," he told reporters. "... I don't think I am being fired today. I'm not so frustrated in this job that I am thinking of leaving."

He continued: "I would tell you, this is the hardest job I've ever had. In my view, the most important job I've ever had."

Kelly quipped that being charged with the running of the White House isn't the best job he's had, though. That title goes to being an enlisted Marine.

And as for all of those photos in which he looks frustrated, like that face palm at the United Nations General Assembly meeting? Just bad timing.

"You guys with the cameras always catch me when I'm thinking hard," he said. "It looks like I'm frustrated and mad."

Contributing: David Jackson and Gregory Korte