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,

Defense Secretary Pete Hegseth on Friday was making an announced trip to the southern border -- without reporters -- as he faces new scrutiny in Washington. ABC News has confirmed that, in at least two separate meetings, Hegseth accused top-ranking military officers of leaking to the news media and threatened to polygraph them.