I would add one thing, just to build on the remarks I made earlier, concerning our ability to export further processed products, such as margarine and shortening.
Think back to the creation of NAFTA in 1993; we're many years after that, and many things have changed. The same thing applies in such processed products as margarine and shortening. For example, with the ban on trans fats in the United States, you need imported palm oil to make processed products such as margarine and shortening. At the time NAFTA was created, that wasn't envisioned. As a consequence, we both import palm oil, into Canada and the United States, to make margarine and shortening, but once you put it into a processed product, you have a tariff on that margarine or shortening going back across the border.
It's things such as this, on which the world has moved significantly since NAFTA was brought in. The rules of NAFTA can be updated in very targeted areas to enable modern commerce to take place. That's one example.