Mr. Garneau brought up article XII. When the new regime was put in place, pressure was brought to bear on the federal government to have it included as an agenda item for the talks between Quebec, the U.S., and Canada. For all the reasons mentioned, neither the Canadian government nor the American government ever had any appetite to address the issue. I sent numerous letters, made plenty of phone calls, and had many meetings in Ottawa with the people in charge at the time. I would say no one wanted to throw sand in the gears, so to speak, when it came to taking a different view of Quebec's situation in light of the changes that had been made. I think that was the most commonly cited reason.
On April 12th, 2016. See this statement in context.