Rep. Kat Cammack, R-Fla., directed heated questions at Chew over an internal memo at TikTok that called on employees to "downplay the parent company ByteDance, downplay the China association, downplay AI."

Cammack displayed an excerpt of the memo, first reported by Gizmodo, on a placard behind her.

0:46

TikTok CEO questioned over internal memo asking employees to 'downplay' China ties

The internal memo, referenced by Florida Rep. Kat Cammack, allegedly called on employees to "downplay the parent company ByteDance, downplay the China association, downplay AI."

"You've said repeatedly that there is no threat, that this is a platform for entertainment and for fun," Cammack said, pointing her finger at Chew. "Why, if you had nothing to hide, would you need to downplay the association with ByteDance and China?"

Chew replied: "Congresswoman, I have not seen that memo."

"You cannot answer that question, Mr. Chew," Cammack said.

Rep. Diana DeGette, D-Colo., asked a series of questions about the spread of misinformation on TikTok, citing a viral post in 2021 that falsely instructed viewers on how to make antimalarial drug hydroxychloroquine from grapefruit and lemon peel.

“What is TikTok doing to try to strengthen its review to keep this information from coming across to people?” DeGette asked.

Chew said misinformation violates TikTok’s rules but acknowledged that the app fails to remove every false post. “I don’t think we can sit here and say we’re perfect,” he said.

“We invest a significant amount in our content moderation work,” Chew said.

2:16

TikTok CEO confronted by lawmakers on tackling misinformation on the app

Rep. Diana DeGette of Colorado said TikTok's plan to tackle misinformation was "not enough" for her.

DeGette later said: “I’m going to stop you right now. I asked you specifically how you were trying to increase your review of this, and you gave me only generalized statements that you’re investing, that you’re concerned, that you’re doing more.”

“That’s not enough for me,” she added. “That’s not enough for the parents of America.”

Facing questions about harmful acts allegedly prompted by TikTok posts, Chew said he supports continued liability protection for social media platforms as a means of protecting free speech.

2:22

Chew says US should 'preserve' section 230

The TikTok CEO said that section 230 has been "very important for freedom of expression on the internet."

Liability protection, stipulated in Section 230 of the 1996 Communications Decency Act, safeguards social media platforms and other sites from legal responsibility that could result from content posted by users.

“[Section] 230 has been very important for freedom of expression on the internet,” Chew said. “It’s one of the commitments we’ve made to this committee and our users.”

“I do think it’s important to preserve that,” he added.

Hours before Chew began testimony on Thursday, China said that a sale of TikTok by China-based parent company ByteDance would require the approval of the Chinese government, the Wall Street Journal reported.

At the hearing, lawmakers asked Chew about the report.

2:45

Shou Chew faces questions on China's reported opposition to sale of TikTok

The House hearing comes as the social media platform with ties to China faces a ban in the U.S.

"Despite your assertions to the contrary, China certainly thinks it is in control of TikTok and its software," said Rep. Michael Burgess, R-Texas. "Is that not correct?"

Chew replied, "TikTok is not available in mainland China, and today we're currently headquartered in Los Angeles and Singapore."

"I'm not saying that the founders of ByteDance are not Chinese, nor am I saying that we don't make use of Chinese employees, just like many other companies around the world," he added.