OTTAWA -- Canada's opposition Liberal Party, led by Justin Trudeau, defeated Prime Minister Stephen Harper's Conservative Party in Monday's snap election, ending nine years of Conservative rule.

     The shift in power to the center-left party casts uncertainty on whether Canada will ratify the Trans-Pacific Partnership trade deal. Trudeau, 43, has been critical of the TPP, a key election issue, calling it an understanding based on backroom negotiations. However, he has also publicly stated that he supports free trade.

     Trudeau, the son of former Prime Minister Pierre Trudeau, was elected head of the Liberal Party in 2013. Support for him among younger voters has been growing since then.