A date has been set for Facebook CEO Mark Zuckerberg’s congressional testimony.

Zuckerberg, 33, will appear before the House Committee on Energy and Commerce on April 12 to explain the improper sharing of 50 million users’ personal information with data firm Cambridge Analytica.

The firm, which was hired by the Trump campaign to target voters, obtained the information from Cambridge University scientist Aleksandr Kogan. When Facebook became aware of the incident in 2015, it made Cambridge Analytica sign legal documents promising to delete all the information. It later emerged that the data had not been deleted, though the firm claims it did not use the data during the 2016 election.

“As the Chief Executive Officer of Facebook and the employee who has been the leader of Facebook through all the key strategic decisions since its launch, you are the right person to testify before Congress about those decisions and the Facebook business model,” wrote Greg Walden (R., Ore.), the committee’s chairman, in a letter to Zuckerberg.

Company sources told CNN that Zuckerberg had decided earlier to testify and is planning his strategy for the appearance. He has already declined to testify about the controversy before Parliament in London, and he may have another such decision to make soon: On Monday, the Senate Judiciary Committee invited him to appear along with the CEOs of Twitter and Google.