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.

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

A computer monitor in Hegseth's office was installed to give him remote access to the Signal app and text messages from his personal cellphone, the sources said. Hegseth has used the system to check and respond to those messages at his desk,