call somebody as a witness

"If I said it didn't happen, would you still call me as a witness?"

At the moment, I can see no necessity of your being called as a witness.

I'm calling you as a witness for the defense, Dave.

His daughter Ruth was not called as a witness in the trial.

To call him as a witness would just make it worse.

He may also be called as a witness by any other party.

And your friend Greg may be called as a witness.

He was later called as a witness in the trial.

"Do you really think I might be called as a witness?"

Should he be called as a witness in this case?