testimony should he be subpoenaed. >> in terms of him testifying, i know that the calculus that mike flynn might have about continuing to cooperate with the government might change for him if he's pardoned if he knows they can't prosecute him anymore. would he end up testifying? he's already given them information. they want to put him on the stand. can they still put him on the stand? would it affect the value of that testimony? >> two things about that. one is, you can compel him to testify and require him to answer questions, but i think when somebody is being compelled, it's very different than if they have an incentive to cooperate. in that scenario, they would be volunteering information, suggesting leads, connecting the dots for you. if instead, you got to pull teeth to answer questions, you'll get yes, no answers. he'll answer the questions, but the other wrinkle here is, even if president trump can pardon michael flynn, he couldn't pardon him from any state crimes