oneils
Member
What? Trudeau is the Prime Minister, not a designate. What are you talking about?
He is still technically leader of the Liberal Party. His constituents have elected him as a member of parliament.
Harper has resigned as leader of the conservative party of canada, but he is still technically prime minister. He still has to hand in his resignation to the governor general. Then the governor general will ask parliament to form a government. He will probably ask Trudeau to try to form a government.
There is a good article about it, here: http://www.macleans.ca/politics/ottawa/when-does-justin-trudeau-become-prime-minister/