[Here is the filing itselfg(https://www.scribd.com/document/400269651/2-22-19-US-Stone-Response-Show-Cause). The fourth footnote is the meat of their contention:
4 To the extent the defendant argues that the presence of reporters outside his home is itself evidence of a prima facie violation, he provides no information to contradict the public statements of the same media organization that it had no advance knowledge of the indictment and had sent crews to multiple potential locations that day. See CNN Business, Debunking Roger Stone’s Anti-CNN Conspiracy Theory , Feb. 13, 2019, available at https://www.cnn.com/2019/02/13/media/roger-stone-cnn-conspiracy-theory/index.html. The Special Counsel’s Office is aware of no information indicating that reporters were given any advance knowledge of a possible indictment from the Special Counsel’s Office.
The Grand Jury met on an unusual day (Thursday instead of the usual Friday), so CNN sent a stakeout to the #1 most likely to be indicted person (by his own admission) in the entire country. No mystery whatsoever. And yet Matthew Whitaker deliberately fueled this dumb theory in his Senate hearing:
Asked by Collins if he is “familiar from public reports or otherwise” that “a CNN reporter was camped out outside of Stone’s house when the FBI arrested him,” Whitaker said he was, and that he finds it “deeply concerning.” Collins followed up by asking if somebody at DOJ “share[d] a draft indictment with CNN prior to Stone’s arrest.” Whitaker didn’t rule it out, and went on to say, “I share your concern with the possibility that a media outlet was tipped off to Mr. Stone’s either indictment or arrest before it was made, that information was available to the public.”
As part of Whitaker's next hearing, he needs to be asked whether he had one shred of evidence to support his suspicions and, if not, why he gave testimony directly counter to the conclusions of the office he was overseeing, knowing it would fuel baseless attacks which undermined the credibility of his Department of Justice.