New York (CNN) A left-leaning PAC ran a Facebook ad falsely claiming that Republican Sen. Lindsey Graham endorsed the Green New Deal. The ad came after Rep. Alexandria Ocasio-Cortez grilled Facebook CEO Mark Zuckerberg earlier this week about the company's policy of allowing politicians to run ads on the platform that are false.

"Would I be able to run advertisements on Facebook targeting Republicans in primaries saying they voted for the Green New Deal," Rep. Ocasio-Cortez asked Zuckerberg at a House Financial Services Committee hearing on Wednesday. Adding, "I mean if you're not fact-checking political advertisements, I'm just trying to understand the bounds here, what's fair game?"

On Thursday, a PAC named "The Really Online Lefty League" posted a false ad that used edited video to make it appear like Graham had endorsed the Green New Deal.

The ad spliced together different audio of Graham speaking to make it sound like he said, "Simply put, we believe in the Green New Deal." Graham never said that.

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