Critique McKenna's knowledge and actions regarding trade and climate issues, and criticize Canada's approach to NAFTA negotiations. Also, suggest that the Canadian government drop the Carbon Tax to appeal to voters.
McKenna does not seem to know that financial trade and climate problems are totally separate.
Most people are aware that the USA is a major polluter, as is China and India , and possibly Brazil, and maybe Mexico. 
Therefore all of these countries should be included in the NAFTA talks,...or..... stop the stupidity.   McKenna is a fool, and is hurting Canada at the negotiating table.   McKenna Freeland and Trudeau seem to be only concerned with voter appeal.  
Want to appeal to voters?  Drop the Carbon Tax.