Later, Sanders shared a version of the video of the exchange in which she said the White House would "not tolerate the inappropriate behavior clearly documented in this video."
By late Wednesday and early Thursday, members of the media and CNN executives were questioning whether the video had been doctored.
According to The Washington Post, the video that Sanders shared and some claimed was edited was first shared by Paul Joseph Watson, known for his conspiracy-theory videos on the far-right website Infowars.
Watson told the website BuzzFeed that he created the video by downloading an animated image from conservative news site Daily Wire. He said he zoomed in on it and saved it as a video and that that may have made it "look a tiny bit different."
Here are the videos from both Sanders and from the C-SPAN broadcast of the incident.