Rep. Alexandria Ocasio-Cortez (D-New York) criticized Mark Zuckerberg after he expressed concern on Twitter for adding fact-checking labels to two of President Donald Trump‘s tweets.

The CEO had a phone call with President Donald Trump on Friday when he told the president his concerns.

Zuckerberg also told Fox News on Thursday that private companies should not intervene in the online statements. 

“I just believe strongly that Facebook shouldn’t be the arbiter of truth of everything that people say online,” Zuckerberg said. “Private companies probably shouldn’t be, especially these platform companies, shouldn’t be in the position of doing that.”

Following these reports, Ocasio-Cortez denounced the Facebook CEO, asserting that he is defending the “white supremacists.”

“Zuckerberg is not worried about being bullied by Trump. He is worried that Facebook’s PR operation is falling apart as it’s exposed that their platform relies on white supremacists & disinformation peddlers to be successful,” Ocasio-Cortez tweeted. “They aren’t ignoring them. They’re protecting them.”

Ocasio-Cortez posted again following her tweet, claiming that Facebook’s decisions are supporting white supremacists.

“Facebook’s ties to white supremacy-linked [organizations] and sympathy for disinformation campaigns is not a small thing,” she tweeted. “It is high-level decision making, and appears to come from the top.”