Mark Zuckerberg will appear before the House Energy and Commerce Committee next Wednesday to answer questions about the Cambridge Analytica controversy.

“This hearing will be an important opportunity to shed light on critical consumer data privacy issues and help all Americans better understand what happens to their personal information online," wrote committee chairman Greg Walden (R-Ore.) and ranking Democrat Frank Pallone (D-N.J.) in a press statement. "We appreciate Mr. Zuckerberg’s willingness to testify before the committee, and we look forward to him answering our questions on April 11th.”

We learned last month that psychology professor Aleksandr Kogan had obtained data about 50 million Facebook users—allegedly under false pretenses—and then turned it over to the political consulting firm Cambridge Analytica. Cambridge subsequently did work for the Donald Trump campaign, leading to speculation that Cambridge had used the Facebook data in a psychographic ad-targeting campaign.

However, after the election—and long before the recent revelations—Cambridge admitted that it didn't actually use psychographic techniques in the presidential campaign, which means that the Facebook data likely didn't play a significant role in the 2016 election.

Nevertheless, the Cambridge leak has inspired a wide-ranging debate about Facebook's privacy practices. At least until 2015, Facebook granted app developers liberal access to the data of Facebook users, and critics say that Cambridge was far from the only firm to harvest Facebook user data for dubious purposes.

Facebook says it has tightened its rules significantly over the last three years and that it is now undergoing a thorough audit to make sure that any data harvested in early years is not misused in the future. But critics have been pressing Facebook to do more to protect user privacy.

While Facebook has beefed up its privacy practices in recent years, Zuckerberg has not committed to providing the protections of the European General Data Protection regulations—widely seen as the strictest in the world—to users outside of Europe. In a Tuesday interview with Reuters, Zuckerberg said that he agreed with the goals of the GDPR "in spirit" but that Facebook is "still nailing down details" of its revamped approach to privacy.

Zuckerberg will have an opportunity to explain Facebook's privacy efforts to members of Congress next Wednesday. He has already acknowledged that Facebook made a mistake, describing the Cambridge leak as a “breach of trust” with users, and we can expect him to express contrition again during the hearing.

Zuckerberg has turned down requests to testify before the parliament in the United Kingdom, sending deputies to testify in his place.