Canada's ruling Liberal Party and opposition New Democratic Party (NDP) have reached a surprise agreement that aims to keep the minority government in power until 2025, Prime Minister Justin Trudeau said yesterday.

Governments with a minority of seats in parliament, like the one Trudeau now leads, tend to last an average of about two years, but this rarely written agreement could permit it to go the entire four-year term after last year's election.

"What this means is that...