The questioning got so hot during the grilling by Sen. Ted Cruz (R-Tx.) Tuesday afternoon that Facebook CEO Mark Zuckerberg was ready to take a break from the session afterward.

Cruz first asked Zuckerberg, “Does Facebook consider itself a neutral public forum?”

Zuckerberg responded, “We consider ourselves a platform for all ideas,” then added when pressed, that certainly they try to keep out hate speech, terrorist content, nudity, “anything that makes people feel unsafe.”

Then Cruz laid into him for the pervasive pattern of bias and political censorship by Facebook of trending conservative news, giving several examples, including stories about CPAC, the Lois Lerner IRS scandal Glenn Beck, shut down Chick-fi-La appreciation day page, blocked posts of Fox News reporter, blocked over two dozen Catholic pages, and “most recently blocked Trump supporters Diamond and Silk’s page of over 1.2 million supporters after determining their brand was ‘unsafe to the community.'”

“To a great many Americans, this appears to be a great pattern of political bias,” Cruz said.

Zuckerberg admitted that Facebook and the tech industry is located in Silicon Valley, and “extremely left-leaning place,” but claimed he tries to make sure that there is no bias in the work they do.

Cruz hit back, asking if he is aware of any page that has been taken down of Planned Parenthood, or MoveOn.org?

Watch the exchange below.