Thanks for the question. It's not a surprise that it's the first one.
The application of a GATT article XXVIII action to imports from the U.S., and from Mexico for that matter, needs to be informed by the rights and obligations that Canada has under the NAFTA. There's a pretty widely held view in the legal community that the terms of the NAFTA do not provide for the establishment of a new tariff rate quota of the sort that's envisioned by the government's announcement on milk protein concentrates a couple of weeks ago.