Canada to head to polls as Mark Carney calls snap election for 28 April

Prime minister launches contest expected to focus on US relations, as Liberals enjoy lead over Conservatives

Canada's prime minister, Mark Carney, has called a snap election on 28 April, firing the starting gun on a contest that is widely expected to focus on the strained relationship with the US amid threats to Canada's economic and political future.

We are facing the most significant crisis of our lifetime because of President [Donald] Trump's unjustified trade actions and his threats to our sovereignty," he said. He wants to break us, so America can own us. We will not let this happen. We're over the shock the shock of the betrayal, but we can never forget the lessons. We have to look out for ourselves. We have to look out for each other."