A Russian-aligned propaganda network notorious for creating deepfake whistleblower videos appears to be behind a coordinated effort to promote wild and baseless claims that Minnesota governor and vice presidential candidate Tim Walzsexually assaulted one of his former students, according to several specialists tracking the disinformation campaign.

Experts believe that the campaign is tied to a network called Storm-1516, which has been linked to, among other things, a previous effort that falsely claimed vice president Kamala Harris perpetrated a hit-and-run in San Francisco in 2011. Storm-1516 has a long history of posting fake whistleblower videos, and often deepfake videos, to push Kremlin talking points to the West.

The propaganda unit’s work has successfully reached the highest levels of the Republican party, with vice presidential candidate JD Vance repeating at least one of their narratives. NBC reported this week that the group has pushed at least 50 false narratives in this manner since last fall, which comes amid a broader Russian government effort to disrupt next month’s election with the aim of helping former president Donald Trump return to the White House.