Nothing will happen to him, because Congressmen can say whatever they want, truth or lie, without any fear of prosecution. Here is a copy and paste.

"The Constitution has a clause that protects Congressmen and Senators from having the Executive Branch claim that their speech is criminal. From Article I, Section 6, speaking of Senators and members of the House:

… for any Speech or Debate in either House, they shall not be questioned in any other Place.

There is however, accountability for lying in an open hearing, at least theoretically. From Article I, Section 5:

Each House may determine the Rules of its Proceedings, punish its Members for disorderly Behaviour, and, with the Concurrence of two thirds, expel a Member.

So, in particular, if a Congressman is proven to have been lying in his opening remarks in each of the recent depositions, he cannot be prosecuted for it. He could, however, be censured or even removed by the House for it. However, removal would require 2/3 of the House to vote for it, and that is not likely, even if it is shown that he or she was paid by Russia to do so."

Basically, they can say and do anything they want and are accountable to only themselves and their peers. Outright lying has been allowed on the floor and in chambers for so long, that nobody even thinks twice about doing it, as long as it advances a point or moves the needle politically. While we are fixing government, this needs to be changed, as well as adding strict term limits and maximum age requirements.