In a Wednesday letter to Zuckerberg, Blumenthal said that Facebook's CEO or Instagram's head should "testify to set the record straight and provide members of Congress and parents with a plan on how you are going to protect our kids."
Blumenthal, who chaired the panel that heard from both Haugen and Facebook official Antigone Davis about the effect of Instagram on kids, also said Davis seemed "to have provided false or inaccurate testimony to me regarding attempts to internally conceal its research."
Zuckerberg once seemed ill-at-ease in Washington, but he's become something of a regular fixture on Capitol Hill. Members of Congress have secured high-profile testimony from the CEO to address concerns over Cambridge Analytica, antitrust and Facebook's cryptocurrency plans, among other issues.
The CEO has rarely made gaffes or groundbreaking confessions during the showdowns, however.
Blumenthal has also set a hearing for next week on social media and kids with representatives from Snap, TikTok and YouTube.