It would make sense to develop this in parallel with the negotiation strategy around CUSMA and have the opportunity to decide whether to go ahead without it or do something that may introduce very interesting possibilities in that negotiation.
One possibility is that the U.S. will want to do something that blocks carbon beyond a particular standard. They may do something that turns out not to be WTO-compliant. We might decide to do something that aligns with that to some degree and could be WTO-compliant. I'm talking about, for example, a standard plus an associated price where we treat all domestics and foreigners on a level playing field even if they chose not to do that. I can't guarantee this would work, but it's conceivable to do a bilateral or regional trade agreement that might have some specific different treatment.
This could be the subject of a negotiated resolution vis-à-vis the United States and Mexico in a CUSMA negotiation that might be different from what Canada would do elsewhere. That's tricky but not out of the question, from a trade law point of view.