STEPHANOPOULOS: But what if you do – if the president does follow your initial recommendation, the recommendation you’re leading towards right now, not to sit down for interview. What happens if Mueller then subpoenas the president?

SEKULOW: You have a bite under the constitution, because it really becomes an Article II question. So what would happen is if – if, and I say if because we have no basis to know that -- at this point, that a subpoena would be filed.

And by the way, interviews can still happen, there could – there could be written questions, there’s other ways this can happen. The president may decide at the end he’s going to not take his lawyers’ advice.

I mean that’s up to him at the end of the day. He’s the president, he gets to make that decision. We’re going to give our advice. But I think look, if you get a subpoena, you file what’s called a motion to quash.

That will be argued at the district court then it would go to the court of appeals, then it would go to the Supreme Court of the United States, from the Supreme Court of the United States it goes back to the lower courts again.

So if – if the Special Council makes the determination and gets the authority, and that’s a question, they have to have the authority to seek that subpoena, a subpoena for live testimony has never been tested in court as to a president of the United States.

https://abcnews.go.com/Politics/week-transcript-18-jay-sekulow-gov-john-kasich/story?id=57041025