Joe Kasper, Hegseth's former chief of staff, is the latest Department of Defense official rumored to be leaving.

Pete Hegseth was barely able to get confirmed as Donald Trump’s Defense secretary, and following a series of scandals — including the revelation that he shared U.S. war plans in a second Signal group chat last month — it’s entirely possible that he will be the first member of Trump’s Cabinet to either resign or be forced out not even 100 days into Trump’s second term.

Defense Secretary Pete Hegseth used the Signal app on a personal computer in his office that was connected to the internet on an unsecured commercial line, what’s known as a “dirty line,” two sources confirmed to ABC News Thursday.