Mueller won't be testifying May 15

No surprise.

"We're talking to the Department of Justice. We're talking to Mueller. Hopefully, he will come in. It won't be next week," the New York Democrat said. "He will come at some point. If necessary, we will subpoena him and he will come."

  al Jazeera

All in all, I think they need to get the unredacted report before they question him.

Nadler reiterated plans to hold former White House Counsel Don McGahn in contempt if he does not appear before the committee to testify on May 21 under an existing subpoena.

"He knows that if he doesn't testify on the 21st without a court order, which he won't get, he'll be subject to a contempt citation," the chairman said.

If only that carried actual consequences.

...but hey, do what you want...you will anyway.