No judge has the constitutional power to stop a defense opening/closing statement, or expert testimony about the constitutionality of the law as it applies to the case at hand. -- That is the issue.
It's not an issue. Judges stop the showboating all the time over settled law. Appeals courts agree with them, and the USSC agree with the Appeals Courts.
So, it's not an issue, paine, no matter how much you stamp your feet and say it is.