Pence said some things on TV that were patently false.  Some of them related to Flynn..  Did Pence know what he was saying was false?   Flynn took the firing fall as if Flynn had lied to Pence.  Did Flynn lie to Pence?  Or did Flynn lie to someone else who then lied to Pence?  Or, did Flynn never lie to Pence?  If Flynn lied to Pence, then Pence is a good witness for any prosecutor putting Flynn on trial.  I don't think Pence wants to be a witness about those kind of things.