The White House's IT department believes that Chief of Staff John Kelly's personal cellphone was compromised at some point before the summer, three government officials told Politico.
Over the summer, Kelly asked the department to take a look at his phone, because it hadn't been working right for several months and couldn't update software, Politico reports. After investigating further, workers determined the phone had been compromised at some point, and Kelly couldn't use it any more. They aren't sure when or where his phone was when it became compromised, or if any data has been accessed by hackers. There's also the concern that a hacker could have gained complete access to the phone, including the camera and microphone.
Before becoming chief of staff in July, Kelly was secretary of Homeland Security. A White House official told Politico that Kelly rarely used his personal cellphone, instead primarily relying on his government-issued phone.