Day 28 of the campaign will have Mr. Scheer hitting the hustings in the 905, with appearances scheduled in Markham and Mississauga.

The debate kicks off at 7 p.m. at the Canadian Museum of History in Gatineau, Que.

Plus, Green Party Leader Elizabeth May is participating in an all-candidates debate on Saturna Island.

Green Party Leader Elizabeth May's itinerary today has her in Victoria, where she plans to make an announcement at around 10:30 a.m, at the campaign office of local candidate Racelle Kooy.

Elsewhere, Environment Minister Catherine McKenna is holding a presser with the Liberals' Carleton candidate, Chris Rodgers, on the 'possible expansion of Bayview Yards.'

'They seem to be making a calculation that their supporters don’t care about environmental protection, and I think that calculation is wrong,' says Catherine Abreu of the Conservatives' refusal to respond to the survey.

Green Party Leader Elizabeth May is in Toronto for an announcement at Ryerson University on post-secondary education.

Leaders will also get a chance to engage in a more freewheeling exchange with one another during the events, with a portion carved out for open debate among them.

Liberal Leader Justin Trudeau's agenda for today kicks off in Toronto with a discussion on gun violence alongside health care experts.

There are marked differences between the Liberals and NDP. NDP supporters rank Canada’s responsibility towards refugees higher on the list over jobs and the economy than Liberal supporters, the survey suggested.

NDP Leader Jagmeet Singh is scheduled to participate in a town hall with NDP candidate Bob Chamberlin, who is hoping to recapture the riding of Nanaimo-Ladysmith, B.C., which the party lost to the Greens.

Weeks two and three of the campaign are typically spent in ridings that are 'on the cusp' of flipping in the party's favour, or where they need to defend seats, says former Conservative aide Garry Keller.

Conservative Leader Andrew Scheer is packing four events, including stumping for two candidates in Brampton and Etobicoke, while Jagmeet Singh is squeezing in some time for a pizza party with Olivia Chow.

Three of the four major party leaders are hitting the debate stage in Toronto tonight. Liberal Leader Justin Trudeau is passing on the chance to spar with the others, and will instead participate in three other debates.

In seeking to contrast his party with the Conservatives, Prime Minister Justin Trudeau leaned on familiar attacks, invoking the spectre of the Harper government’s decade in office and the unpopular Ford government.

Spending in the last quarter climbed to $1.6-million from $1.4-million over the same period a year ago, according to the latest disclosures.

Elsewhere, Conservative Leader Andrew Scheer is kicking off his campaign in Quebec and ending the day in the GTA.

Though the economy typically weighs heavily on voters' mind, this campaign could see the environment as a major ballot box issue.

Plus, Environment Minister Catherine McKenna is expected to deliver a keynote speech at the Canadian Firefighters Annual Memorial Ceremony.

Plus, Green Party Leader Elizabeth May is slated to headline a town hall hosted by the National Council of Canadian Muslims.

Plus, In Regina, Public Safety Minister Ralph Goodale plans to make an announcement with Public Services Minister Carla Qualtrough on efforts to fight human trafficking.

With election day just weeks away, and Andrew Scheer still vying to position himself as a credible alternative, the Liberals’ attacks couldn’t have come at a worse time for the Conservatives, says Nik Nanos.

The list isn’t an exhaustive look at all the contenders who have been vocal on climate action.