-- A Michigan man is facing charges after he allegedly made threatening calls to CNN's Atlanta headquarters, telling workers that he would come "to gun you all down," according to court documents obtained by ABC News on Monday.
Griesemer is accused of violating federal extortion and interstate communications rules.
"You are going down. I have a gun and I am coming to Georgia right now to go to the CNN headquarters to f----ing gun every single last one of you," the caller said on one of the occasions, according to the affidavit. "I have a team of people. It's going to be great, man. ... You gotta get prepared for this one, buddy."
"Fake news! I'm coming to gun you all down,” the caller said in another instance.
The caller also made derogatory comments toward Jewish people and referred to CNN employees by the n-word, according to the affidavit.
Federal investigators said they traced the calls to a mobile phone belonging to Griesemer.
The FBI cited location data and audio analysis in its criminal complaint against Griesemer. It was not clear if Griesemer had obtained an attorney as of early Tuesday morning.
CNN acknowledged the ongoing investigation in a statement on Monday and said it was in touch with law enforcement.
"We take any threats to CNN employees or workplaces, around the world, extremely seriously. This one is no exception," the statement said. "We have been in touch with local and federal law enforcement throughout, and have taken all necessary measures to ensure the safety of our people."
"This is why Trump’s words and tweets, and his memes showing violence against the press, matter," Navarro said in a tweet Monday night, referring to the Griesemer case.
ABC News' Josh Hoyos contributed to this report.