Facebook founder and CEO Mark Zuckerberg hit Washington DC on Monday and has his first of two high-profile hearings in front of the U.S. Congress in the wake of the data breach scandal that has engulfed the social media giant.. The first is today when testifies before a joint session of the Senate Committee on the Judiciary and Senate Committee on Commerce, Science, and Transportation

The hearing, entitled “Facebook, Social Media Privacy, and the Use and Abuse of Data,” is set to begin now in Room 216 of the Hart Senate Office Building. Watch the livestream above.

Zuckerberg has been making the rounds ahead of the hearings — he sits tomorrow before the House Energy and Commerce Committee — regarding Facebook’s use and protection of user data. The D.C. swing comes amid a rare Zuckerberg media/apology tour, following revelations that political consulting firm Cambridge Analytica might have harvested the data of up to 87 million Facebook users. The social network has acknowledged that the public profiles of its 2 billion users might have been collected without their knowledge or permission.

Facebook has also been on the front lines of a fight against Russian interference in the 2016 U.S. presidential election, with some 126 million users potentially having been exposed to content produced and circulated by outside propagandists trying to foment discord. Some in D.C. have suggested the need for government regulation, to which Facebook’s Cheryl Sandberg has said the company is open.

Stay tuned for Deadline’s coverage of the hearing.