The province said federal quarantine rules are being bypassed by travellers who book return flights into nearby US airports, take a taxi or limousine to a land border crossing, and then walk or drive across the border.
Meanwhile, Ford said he will not relent in his campaign to further restrict global travel "because too much is at stake".
Trudeau dismissed Ford's claims that Canada's "borders are broken", maintaining that there are already tight controls on land crossings, including tests before and after arriving in Canada and mandatory two-week quarantines.
Out west, COVID-19 hot spots in a Rocky Mountain tourist town and northeastern Alberta's oilsands hub asked for more details from the provincial government before deciding to request curfews.More news: Dozens killed in stampede at Israel pilgrimage site
Canada's Chief Public Health Officer Theresa Tam also said Friday that most COVID-19 cases across the country are now a variant of concern.
When asked by reporters on Thursday whether the government's program would be enough to lead to the best case scenario of less than 1,000 daily COVID-19 cases, Ontario Science Table Co-Chair Dr. Adalsteinn Brown replied simply by saying "No". The HKPR have shown that here in Northumberland we had just 1 new Covid-19 case today while Kawartha Lakes 6 and Haliburton had 1 case. As long as these massive loopholes exist, we're not safe from these new variants.
Since February 2021 there's been a three-day hotel quarantine rule in place for people coming into or returning to Canada by air. The premier said it is time for the federal government to shut the airport down. "And stop the variants from coming into our province".
In the past two weeks, according to the letter, 150,000 people (in addition to essential commercial truckers) have crossed Canada's land borders, including dozens who crossed between April 24-26 after arriving from countries where direct flights to Canada are now banned.More news: Registration for 18+ age group from today
Meanwhile, Manitoba expanded its COVID-19 vaccine eligibility to adults who are pregnant, receive community living disability services or work in health-care settings. He said the measures are effective and have been catching the virus before it spreads.
"Last week, the new Indian variant was reported here in Ontario and it didn't swim here".
There were eight new COVID-19 cases in Newfoundland and Labrador, all but one of which were linked to travel within Canada, said officials.
"This is exciting news", she added, echoing comments at a separate news conference by Quebec Health Minister Christian Dube who announced that the province "will be able to give a first dose to all adult Quebecers who want it by June 24".More news: Caitlyn Jenner Is Officially Running for Governor of California