Mark Zuckerberg Declines To Appear Before "International Grand Committee" Investigating Facebook

Facebook CEO Mark Zuckerberg will not appear before an "international grand committee" of at least five governments investigating disinformation and election meddling, according to a letter from Facebook obtained by CBS News.

Zuckerberg initially turned down an invitation by Damian Collins, a member of British Parliament,  and Bob Zimmer, a Canadian lawmaker. But he was invited again after Argentina, Australia and Ireland signed on to the joint inquiry.

On Monday, Facebook's Head of Public Policy for the United Kingdom, Rebecca Stimson, declined on Zuckerberg's behalf, writing in the letter that Zuckerberg will be unavailable.

"Thank you for the invitation to appear before your Grand Committee. As we explained in our letter of November 2nd, Mr. Zuckerberg is not able to be in London on November 27th for your hearing and sends his apologies," Stimson wrote.

Facebook CEO Mark Zuckerberg testified before a combined Senate Judiciary and Commerce committee following the Cambridge Analytica scandal

Zimmer told CBS News that the international group of politicians intend to respond to the rejection soon. Zimmer is chair of the Canadian Parliament's Standing Committee on Access to Information, Privacy and Ethics.

He noted that Facebook did not address whether Zuckerberg might be available in the future. Facebook did not immediately reply to an email from CBS News seeking clarification on that point.

The letter from Facebook includes a rundown of efforts and studies documenting the company's ongoing push to combat false news and the work done by its election teams to bring transparency to political advertising.

"You may have heard us refer to some of this work already during the many hearings and communications we've had with committees and Governments around the world," Stimson wrote.

READ MORE: PM Wants Zuckerberg To 'Explain Himself To The Australian People' 

READ MORE: Don't Be A Zucker For Facebook's Claims It Will Clean Up Its Act

Facebook has repeatedly noted in its refusals to send Zuckerberg to Westminster that Zuckerberg has appeared before Congress and the European Union Parliament, saying in a Nov. 2 letter, "It is not possible for Mr. Zuckerberg to be available to all Parliaments."

The grand committee says its five governments represent 170 million Facebook users. It proposed meeting in one location, offering a  way for Zuckerberg to address their concerns.

More governments may sign on, according to a spokesperson for the British Parliament's Digital, Culture, Media and Sport Select Committee.

"There is growing interest from other nations to join the committee," the spokesperson said in an email to CBS News. She did not indicate which specific countries are interested. On Monday, the U.K. committee launched a social media campaign aimed at pressuring Zuckerberg to attend.

If Zuckerberg ultimately does not appear, Zimmer told CBS he'll consider issuing a subpoena for the 34-year-old to appear before Canada's Parliament. Zimmer said the Canadian legislature could consider holding Zuckerberg in contempt if he's a no-show in that scenario.

Contempt of parliament citations for individuals have very rarely been invoked in Canada's history. The most recent instance was a 2011 case involving a government official accused of misleading a committee.

READ MORE: Why The Facebook Scandal Impacts You More Than You Think

The effort to get Zuckerberg to appear before the multi-nation investigation comes after Britain's Information Commissioner released a report on November 5 concluding that "Facebook... failed to keep [users'] personal information secure because it failed to make suitable checks on apps and developers using its platform."

That conclusion mirrors a scathing preliminary report on "disinformation and fake news" written by the U.K. committee in July. It called for increased oversight of social media companies and election campaigns, while highlighting the use of "scraped" Facebook data by companies associated with the successful Brexit campaign and President Donald Trump's 2016 run.