Prime Minister Mark Carney is expected to ask the Governor General on Sunday to dissolve Parliament, marking the beginning of a federal election campaign.

Sources have confirmed to CBC News that election day will be on April 28 — meaning federal parties will be sprinting through the shortest election period possible under Canadian law.

Federal campaigns must be between 37 and 51 days in length, according to Canada’s election rules, and election day must fall on a Monday (with a few exceptions). Should Carney call the election on Sunday, April 28 would be Day 37 of the election period.