Hillary Clinton’s campaign is flipping the script on Vermont Sen. Bernie Sanders, claiming that he is the one attempting to “overturn the will of the people.”

“Really, I think when you talk about rigging the system, that’s what Sen. Sanders is trying to do now,” Clinton press secretary Brian Fallon said Tuesday on CNN. “Hillary Clinton has won in the popular vote by a wide margin. She’s got more than 2 million votes over Sen. Sanders in all of the contests when you add them all up.”

Sanders supporters have been upset throughout the election at the role of superdelegates, Democratic party insiders and elected officials who may support any candidate at the party convention, regardless of their states’ preferences. Clinton leads in pledged delegates and superdelegates.

The Sanders campaign now has to fight the uphill battle of overtaking Clinton in pledged delegates and then convincing superdelegates to switch their support.

Fallon said, “So now that’s forcing Sen. Sanders to go out and talk about the idea that he wants to try to flip superdelegates and get him to overturn the will of the people as expressed through who’s won the most contests.”

“If anybody’s trying to rig the system right now to overturn the will of the people right now, it’s Sen. Sanders,” he said.