The FBI launched a probe that zeroed in on the Hill campaign in 2019, according to FBI correspondence reviewed by The Intercept. Hill did not immediately respond for comment.

The FBI traced the hacking to an Amazon Web Services account tied to the email address [email protected], though the credit card used to pay for the service was listed under Dam. The Hotmail account had been created in 2002 using the subscriber name “Arthur Slam.” Dam also used the Hotmail account as the recovery email for his own Gmail account.

“I’m absolutely shocked and saddened to learn today that Katie Hill’s campaign associates hacked my campaign in order to help her advance through the primary,” Caforio told The Intercept. “This should serve as a reminder that Russia is not the only threat to our democracy. There are bad actors on all sides who will do anything for their own personal gain, and we need to come together as Americans to defend our country and hold everyone responsible accountable.”