Garrett Graff:

Yes, I mean, we sort of have to read the tea leaves of every action in this investigation, because we are not getting any leaks from inside Robert Mueller's team.

So I think that there are a couple of things to read into today's criminal filing. One is, Robert Mueller sees someone lying to Congress about Russia as under his purview. That's potentially very bad news for anyone else who was involved in testifying before the House or the Senate over the last two years who lied in their testimony.

You heard in that tape package that there's potentially others who are exposed in that realm. And this is also a case — you remember, all of the other Michael Cohen prosecutions up until this point have been handled by prosecutors in New York, in the Southern District of New York.

So this is the first time that Robert Mueller is stepping in and putting his own stamp on the case against Michael Cohen and saying, we intend to have Michael Cohen as a cooperator going forward. He's given about 70 hours of testimony and meetings with Robert Mueller's team so far.

This is the first time we're seeing any public evidence of it. I don't think it's going to be the last time we see Michael Cohen appearing in court evidence.