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WATCH: Facebook, Twitter, Google testify in Senate intelligence committee hearing on Russia

Representatives from three tech giants — Facebook, Google and Twitter — will face more scrutiny Wednesday as they testify in the second of several Congressional hearings this week about how Russia may have used social media to meddle in the 2016 election.

On Wednesday, representatives from all three major tech companies are set to testify before the Senate intelligence committee beginning at 9:30 a.m. ET. Watch live in the player above.

Representatives from the tech companies testified before a Senate Judiciary subcommittee on Tuesday, reporting to senators about Russian activity on their social media platform.

Ahead of the hearing, Facebook said a single Russian group potentially reached about 126 million users by posting more than 80,000 times on the social media platform. Meanwhile, Twitter said it detected and halted more than 2,700 accounts associated with the pro-Russia Internet Research Agency.

The congressional hearings will no doubt press the companies on how they can prevent further interference in future elections.

PBS NewsHour will update this story as it develops.

WATCH : Facebook, Twitter, Google testify in first of three hearings on Russian activity on social media