He expressed reservations about the privacy policies of social media platforms, which he said bar parents from knowing how their children died. "That cannot be right," a visibly upset Harry said.

His wife, Meghan Markle, was present but withdrew from an address on Tuesday's panel.

The European Commission regulates online platforms through its Digital Services Act and is planning a special regime for minors under the Kids Act. The proposal would bar under-13s from using most social media platforms and formalize requirements on parental controls.

The couple brought an air of celebrity to the Parliament, with heightened security and a clamoring press pack, including many journalists from the U.K. Dozens of parliament employees and lobbyists gathered outside the room, phones in hand, to catch a glimpse of the pair.

Meanwhile, the internal market committee, which is leading negotiations for the Parliament on the Kids Act, was meeting in a far less crowded room. MEPs from the committee — including Hungarian conservative Dóra Dávid and Slovak liberal Veronika Cifrová Ostrihoňová — attended the royal event.