US Democratic presidential candidate Hillary Clinton speaks at the American Federation of State, County and Municipal Employees convention in Las Vegas. Thomson Reuters An influential reporter at Politico made an apparent "agreement" with the Democratic National Committee to let it review a story about Hillary Clinton's fundraising machine before it was submitted to his editors, leaked emails published by WikiLeaks on Friday revealed.

Reporter Kenneth Vogel sent an advanced copy of his story to DNC national press secretary Mark Paustenbach in late April.

The email's subject line read: "per agreement ... any thoughts appreciated."

"Vogel gave me his story ahead of time/before it goes to his editors as long as I didn't share it," Paustenbach wrote in an email to Luis Miranda, the DNC's communications director.

"Let me know if you see anything that's missing and I'll push back," he added.

A leaked email revealed that a top Politico reporter gave a DNC representative an advanced copy of a story as part of an "agreement." WikiLeaks

The final copy of the story did not appear have any significant edits, and Clinton's campaign seemed unhappy with the final copy of the article. But sending an advanced copy of a story to a subject represents a break from typical journalistic ethics.

Neither Vogel nor a representative for Politico were available for comment at the time of publication.

A person with knowledge of the agreement, however, said that it was made to ensure accuracy in a complex story.