If I was going to debate the legality of the Constitution it would be on the grounds of its adoption an haw well that followed the rules set up by the articles of confederation.This reminded me of a guy I have run across a few times. He says the Constitution is not legal because the majority of the people alive today didn't vote on it. So are you bound by laws past before you were born ? He says no. What do you say ?
Then being southern there is the issue of whether using military force to keep states under the union is Constitution...
His point of view is a valid one though an I think a similar one was bough up at the beginning of the revolutionary war. Its not a point of view known to win in court but as won threw war.