Retired Lt. Gen. Michael Flynn routinely broke rules and security measures during his career with the Army, he told The New Yorker for a new profile.

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Flynn, Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's newly named national security adviser, told The New Yorker's Dana Priest that he would sneak out of the CIA station in Iraq when he was assigned there without the "insane" required approval from headquarters.

He also said he had technicians install an Internet connection in his Pentagon office, even though it was forbidden.

Another time, Flynn said he gave classified information to NATO allies without approval, which resulted in an investigation and a warning from superiors.

Flynn's former colleagues the Defense Intelligence Agency, where he served as director, described him as someone they liked personally, but not as a good leader.

He would often say things that weren't true, one subordinate told The New Yorker, such as stating that Iran had killed more Americans than al Qaeda.

Flynn was also known to have a temper, former associate said, and berated people of front of colleagues.

Flynn was eventually told he had to leave the DIA by James Clapper, who until last week, was the Director of National Intelligence.

Flynn emerged as a emphatic supporter of Trump throughout the campaign. Last week, the president-elect announced he would tap Flynn for the role of national security adviser.