A couple weeks ago, a Republican candidate for president suggested that if elected, he'd renegotiate NAFTA or break it. What would be involved in either of those processes? Or specifically:
Repeal/Withdrawal
Would simply floating a "repeal NAFTA" bill through the legislature and getting it signed by the President be sufficient to withdraw from NAFTA? (Can't imagine otherwise, national sovereignty and all that.)
Violation
What are the penalties for members to the treaty if they violate its provisions?
Renegotiation
Are there any provisions in the treaty for amendments, or would "renegotiation" basically be like passing another treaty?