CNN is reporting Trump ordered Cohen to lie to Congress:

Trump Told Michael Cohen To Lie

Apparently Cohen told this all to the Mueller team, and Mueller has emails and documents that back up his story. That's called Suborning Perjury (essentially conspiracy to commit perjury), and it's coequal to Perjury. That's not perjury about a blow job. It's perjury about Trump's relationship with Russia. It's probably about the involvement with the Moscow tower throughout the campaign, and Trump may very well have told the same lie to Mueller in his written answers, since that lie was the "story" Cohen was coordinating with everybody before he confessed to Mueller.

I think the final Mueller Report is going to contain more than one documented case for impeachment.