A new Mainstreet Research poll shows Erin O'Toole's Conservatives with a sustained lead over Prime Minister Justin Trudeau's Liberals. With 1,892 participants, the IVR polls has a margin of error of 2.3 percent.

Behind Trudeau's Liberals, Jagmeet Singh and the NDP sit at 18 percent, followed by Maxime Bernier's PPC with 7 percent.

Yves-François Blanchet of the Bloc Quebecois is at 6 percent, followed by Annamie Paul's Greens, who sit at just 3 percent.