The prime minister made a highly anticipated appearance before an inquiry looking into foreign meddling.
Erin O'Toole only lasted 18 months - and was blamed for Justin Trudeau's party's victory last year.
Canada's Conservative leader promised to stay on, adding that he has more work to do to win.
His Liberal Party retains power but he fails to secure the majority he wanted when calling the snap election.
Canadians are voting on Monday and Justin Trudeau's party faces a stiff challenge to retain power.
Things like advanced voting and federally-run elections make it easier for Canadians to vote.
Canada's skyrocketing housing costs have become a key election issue this year.
The new Conservative leader has tied Justin Trudeau in the polls with a pitch to moderate voters.
Amid a severe drought in the Prairies, some ranchers are trying to find ways to work with nature.
