During a recent “dressing down” by President Donald Trump, new White House Chief of Staff John Kelly told aides that he’s never been spoken to like that in his whole military career.

According to a report by the New York Times, Kelly reportedly told sources close to a fight between the president and his chief of staff in August that he won’t tolerate such behavior again.

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After lashing out at Kelly when staffers “gently suggested [Trump] refrain from injecting politics into day-to-day issues of governing after last month’s raucous rally in Arizona,” he lashed at Kelly, who happened to be “the most senior aide in his presence.”

Kelly “reacted calmly, but he later told other White House staff members that he had never been spoken to like that during 35 years of serving his country,” three sources close to the fight told the Times. “In the future, he said, he would not abide such treatment.”