May 1 (UPI) -- A British lawmaker threatened Facebook CEO Mark Zuckerberg with a formal summons Tuesday to get him to testify about the Cambridge Analytica scandal.
Digital, Culture, Media and Sport Committee Chairman Damian Collins said he will issue the summons if Zucker doesn't agree to appear.
Zuckerberg has already provided evidence to the European Parliament this month, and has planned a European trip, Collins wrote in a letter to Facebook head of British policy Rebecca Stimson.
In the letter, Collins said he wants Zuckerberg to testify in London by May 24.
"It is worth noting that, while Mr. Zuckerberg does not normally come under the jurisdiction of the U.K. Parliament, he will do so the next time he enters the country," Collins wrote in the letter. "We hope that he will respond positively to our request, but if not the committee will resolve to issue a formal summons for him to appear when he is next in the U.K."
Last month, Zuckerberg testified about the Cambridge scandal before two committees in the U.S. Congress. During his appearances, he defended some of his company's actions and apologized for lapses in other areas.
Collin's threat may have been prompted by Zuckerberg declining an invitation to testify before the panel last month, when it first surfaced that Britain-based data firm had breached the data of 87 million Facebook users.
Facebook Chief Technology Officer Mike Schroepfer appeared in Zuckerberg's place, but Collins said his testimony was "disappointing" and left dozens of questions unanswered.
"There are over 40 million Facebook users in the U.K. and they deserve to hear accurate answers from the company he created and whether it is able to keep their users' data safe," Collins wrote in the letter.
Facebook announced Tuesday it would roll out a feature in the coming months -- called "Clear History" -- that will inform users which companies are tracking their web activity.