Cambridge Analytica and the professor have denied violating Facebook’s terms, according to media reports.
The scrutiny presented a new threat to Facebook’s reputation, which was already under attack over Russians’ use of Facebook tools to sway American voters before and after the 2016 U.S. elections.
Republican Senator Jeff Flake said he had a lot of questions about the data taken from Facebook, including who knew it had been taken and whether it is still being used.
“This is a big deal, when you have that amount of data, and the privacy violations there are significant,” he told CNN’s “State of the Union” program. “So the question is who knew it and when did they know it, how long did this go on and what happens to that data now.”
Facebook faced new calls for regulation from Democratic senators on Saturday and was hit with questions about personal data safeguards, but it was unclear whether the Republican-controlled Congress would act.
U.S. Representative Adam Schiff, the top Democrat on the House Intelligence Committee, said more investigation was needed.
“We need to find out what we can about the misappropriation of the privacy, the private information of tens of millions of Americans,” he said Sunday on ABC’s “This Week.”
Also on ABC, Senator James Lankford, a Republican, said it was not known whether the incident was connected to the Trump campaign.