"I will not attend the meeting with Mr Zuckerberg if it's held behind closed doors".
European Parliament president Antonio Tajani on Wednesday said Zuckerberg had accepted the EU institution's invitation to travel across the Atlantic and face lawmakers in person as soon as next week.
The entrepreneur will answer questions about the way it handled and shared the personal data of its users following the Cambridge Analytica scandal.
But in stark contrast with his public and televised appearance in front of the United States Congress in April, Zuckerberg is scheduled to attend a closed session in Europe with no cameras.
Zuckerberg's Brussels visit comes just days ahead when European Union's General Data Protection Regulation (GDPR) will come into play on May 25. "It is a step in the right direction towards restoring confidence".
Facebook CEO Mark Zuckerberg is expected to speak with leaders of the European parliament next week about the data protection scandal that has engulfed his company but might avoid a public testimony like the one he endured in the U.S.
Zuckerberg will also be meeting with French president, Emmanuel Macron on 23 May. "It must be a public hearing - why not a Facebook Live?" tweeted Guy Verhofstadt, a Belgian politician who is also a Brexit negotiator on behalf of the European Parliament.
The EU and British parliaments have been calling for Zuckerberg to appear before them for weeks ever since it emerged that a company, political consultants Cambridge Analytica, had been allowed to misuse the data of millions of Facebook users.
The 40-page letter, in response to the committee's formal request for Facebook to respond to 39 points it felt Facebook CTO Mike Schroepfer answer answered unsatisfactorily last month when he appeared before MPs, arrived three days after an initial 11 May deadline - with Facebook requesting, and being granted, an extension.
Parliament's media committee said Thursday that Alexander Nix had accepted a summons to appear June 6.