A reporter for U.S. News & World Report reached out to staffers from Hillary Clinton’s 2008 campaign in 2015 to ask about sexual harassment claims a source made against Marlon Marshall, who is currently the director of state campaigns and political engagement for Hillary Clinton’s 2016 presidential campaign.

That reporter, David Catanese, heard from sources that Marshall faced no consequences despite repeatedly sexually harassing coworkers on the Clinton campaign in 2008. The source said the reason Marshall avoided reprimand was because he was a close ally of Robby Mook, who is currently Clinton’s campaign manager.

“The source also claims that Clinton campaign manager Robby Mook was made aware of the issue, but declined to act on it or intervene because he is personal friends with Marshall.”

Nothing ever came of the story after Catanese contacted a former Clinton staffer for comment.

Catanese reached out to Mara Lee, a former Clinton aide, on Jan. 19, 2015, by email. Catanese’s source seemed to be another woman who worked on Clinton’s 2008 campaign alongside Marshall.

“I was recently contacted by a source who claims to have worked on the 2008 Hillary Clinton campaign and is alleging that Marlon Marshall made unwelcome sexual advances and propositions towards women on the campaign repeatedly,” wrote Catanese. “The allegation is that he would ‘corner women, make them uncomfortable and make suggestions about having sex.’ The source encouraged me to contact women who worked under him in the Nevada office. I was wondering if you were able to describe your experience with Marshall and if any of this rings true, with you or anyone else you know who worked there.”

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Catanese was also told that Mook may have ignored charges against Marshall, as he was tight with him.

“The source also claims that Robby Mook was made aware of the issue, but declined to act on it or intervene because he is personal friends with Marshall,” Catanese said. “Do you know if there is any truth to this?”

But Mara Lee didn’t have such an experience, and shared Catanese’s email with Mook and Marshall.

The email chain from Jan. 19, 2015, was forwarded to Clinton campaign Chairman John Podesta by Mook.

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“Happy to speak out based on my very positive experience working with all of you if that helps — on or off the record,” Lee said in an email to Marshall, Mook, and Podesta.

Catanese responded to what must have been many inquiries via Twitter.

“RE: inquiries, I got a tip, I followed through, but could not substantiate the claims. Pretty standard journalism,” Catanese tweeted Tuesday afternoon.

Requests for comment emailed to Mook and Marshall by LifeZette were not returned.

The issue is bound to raise questions about media standards on sexual harassment charges. Republican presidential candidate Donald Trump has seen charges go to print against him with similar or less substantiation than one firsthand source.

In one infamous exchange on CNN, Erin Burnett confronted a Trump surrogate with a story about an anonymous friend who said she was kissed by Trump. Burnett did not produce anything more than her story.

Update: This story has been updated to reflect comment from David Catanese.