The whistleblower, former Cambridge Analytica employee Christopher Wylie, alleged that the firm accessed the information of 50 million Facebook users without their permission and used it to drive the politically divisive tone of the Trump campaign.
Grewal said that the account was suspended because University of Cambridge Psychology Professor Aleksandr Kogan "lied to us and violated our Platform Policies".
Questions are also being raised about Cambridge Analytica's role in Britain's vote to leave the European Union in 2016.
The U.K. High Court authorized a search warrant Friday evening for Cambridge Analytica headquarters, and roughly 20 members of Britain's data watchdog raided the office about an hour later, Reuters reported.
Investigators were looking at documents and taking photographs and eventually emerged at approximately 2.50am, with a van thought to be carrying evidence leaving from a back exit.More news: Russian spy: Skripal asked Putin if he could return home
More news: Hoosier unemployment inches lower for February
More news: Europe gets last minute reprieve from Trump tariffs
Last month, Cambridge Analytica Chief Executive Alexander Nix denied to a parliamentary committee the company worked for Leave.
Having sat through the five hours of increasingly dense legal argument, including full length submissions from both of CA's barristers which took the hearing well beyond the court's normal closing time, His Honour Judge Leonard QC rejected CA's arguments and granted the warrant at 7pm GMT.
U.S. lawmakers on Friday asked Facebook Chief Executive Mark Zuckerberg to come to Congress to explain to explain how the data got into Cambridge Analytica's hands, adding to pressure on the firm, which is under fire from investors and advertisers.
Mr Zuckerberg on Wednesday admitted the company "made mistakes" but said steps had been taken to protect users.
"As anyone who is familiar with our staff and work can testify, we in no way resemble the politically-motivated and unethical company that some have sought to portray", he said in the statement.