Facebook is saying first that Six4Three's case is without merit and second that for the UK Parliament to publish documents sealed by the USA courts would be hasty and wrong.
A cohort of global lawmakers is trying to turn up the pressure on Facebook, grilling one of its executives and making a show of founder Mark Zuckerberg's refusal to explain to them why his company failed to protect users' data privacy.
The hearing comes after the committee's chairman, Damian Collins, took the unusual move of forcing the CEO of an app maker to turn over confidential Facebook documents. When he refused to handover the documents, he was "escorted to parliament" and informed that he was risking fines for the same.
When he visited London recently, the culture, media and sport select committee demanded that he hand the documents over to Parliament.
Prepare for political fireworks on Tuesday as politicians from around the world gather for an "unprecedented" hearing into disinformation, fake news and privacy on Facebook's platform, hosted by the United Kingdom parliament.
Mr Collins commented on the incident to the Observer, saying: "We are in uncharted territory".
He said Facebook had some "very serious questions" to answer and accused it of misleading the committee over Russian involvement on the platform.
Those documents supposedly contained information on Facebook's data and privacy controls before the massive breach came into light.
The Cambridge Analytica scandal stems from the discovery that an academic at the University of Cambridge - Dr Aleksandr Kogan - used a personality quiz to harvest up to 87 million Facebook users' details.
Taking on the American courts, using arcane procedures that have not been employed in living memory and getting involved in a case where a plaintiff seems to be arguing that Facebook was too strict about the use of data certainly seems risky.
The Tory MP tweeted this evening: "The @CommonsCMS has received the documents it ordered from Six4Three relating to Facebook".
Allan pleaded with Collins not to raise the material at the hearing, which MPs are entitled to do under Parliamentary privilege, "until we have further guidance from the court".