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.

Pete Hegseth has been accused of leaving himself open to hacking by America’s enemies by using his personal phone number in a top security Signal chat that was easily accessible on numerous internet sites and apps.

President Donald Trump's defense secretary, Pete Hegseth, had an internet connection that bypassed the Pentagon’s security protocols set up in his office, two people familiar with the line told The Associated Press.