His voting record in Congress disagrees with your assessment. If you have an example of his voting in violation of Constitutional principle, I, for one, would like to see it. He has a long history of congressional votes, so surely you can find one. Since you claim he only pretends to be a defender of the Constitution. This will be interesting to watch.
I must admit I do know of one, which he has already admitted mistake. You see, he believes congress should follow it's constitutional duty to declare war before sending troops off to war. He claims he was promised they knew where OBL was, and that they would capture him. So he went against the Constitutional requirement to get OBL in Afghanistan. He voted for the resolution authorizing the President to send troops to Afghanistan. Again, our Constitution requires congress to declare war. So, by signing onto that resolution, he was in violation.
If you know of another, then by all means, bring it on.
PS They don’t call him Dr. No, for nothing. So, happy hunting. I will await your findings.