Toronto is the capital of Ontario, the most populous of the 10 provinces, where cases could treble by the end of May unless tough restrictions are imposed, the Canadian Broadcasting Corp. cited sources as saying.
Some Ontario hospitals say they are close to breaking point as the latest wave rips through the province. The head of its main nurses organization is demanding a full lockdown including a curfew.
"In Toronto in particular, numbers are breaking record after record ... there's no doubt that Canada's largest city is struggling under the weight of this third wave. So we're going to do whatever it takes to help," Trudeau told reporters.