Facebook, Twitter and Google are set to appear in front of the United States Congress on Tuesday and Wednesday, as part of an investigation into Russia’s involvement in the 2016 presidential election. It comes at a tense time for the three firms, who have faced intense questioning over their role in facilitating the rise of Donald Trump to the presidency last year.

The hearings may go some way to clarifying some of the issues around the companies’ policies. Just days ago, Twitter announced that it would stop serving advertisements from Russia Today and Sputnik, after the intelligence community pointed to the two as implementing state-sponsored Russian efforts to disrupt the 2016 U.S. election. This led to some confusion around what Twitter’s policies actually are, as the company still allows RT to tweet as much as it wants.

The trio are set to appear three times in front of Congress. Senior vice president and general counsel Kent Walker will be representing Google, general counsel Colin Stretch will be representing Facebook, and general counsel Sean Edgett will be representing Twitter.

Here’s how to watch the hearings, and a little information regarding what you’re in for if you do:

Senate Judiciary Subcommittee

The three companies will testify at the Senate Judiciary subcommittee hearing. The event will focus on disinformation, and how to counteract extremist content.

The hearing, which is scheduled to start on Tuesday at 2:30 p.m. Eastern time, will be available to view here.

Senate Intelligence Subcommittee

The three companies will testify at the Senate Intelligence subcommittee hearing, where they will be asked about Russia’s involvement in the 2016 election. The hearing, scheduled to start on Wednesday at 9:30 a.m. Eastern time, will be available to view here.

House of Representatives

The three companies will testify to the House Intelligence subcommittee, in a hearing scheduled to start at 2 p.m. Eastern time on Wednesday. The event will focus on Russia’s social media influence in the 2016 election. It will be available to stream here.