Votes were being counted Monday in a Canadian election that will choose a leader to confront Donald Trump’s trade war and annexation threats, which the US president renewed in an election day message.

After a year of plummeting poll numbers for Canada’s ruling Liberal Party, a shock defeat in a Toronto by-election marked a turning point. The loss in a Liberal stronghold is widely seen as setting off the chain of events leading to Justin Trudeau’s resignation and Monday’s federal election.