And what will it be fought on? The conservatives think they have the perfect recipe for toppling Justin Trudeau's Liberals, and they've managed to build a loose coalition at the provincial level dedicated to helping them do it. The issue is the carbon tax, a policy that both the Liberals and Conservatives think is a winning one for them. That makes it a perfect battleground for the 2019 federal election.
So how did the conservative coordination happen on the ground? How rare is it for provincial and federal parties to walk the same path? Do Trudeau's Liberals have an effective counter-punch for an attack as old as time? And how nasty will this get in the run-up to the 2019 election?
GUEST: Paul Wells, senior writer, Maclean's