Prime Minister Justin Trudeau says current restrictions, which were brought in to help slow the spread of COVID-19, will be extended another 30 days to July 21.
"The reality is that even as we start to reopen, a lot of people still need this support to pay their bills while they look for work", Trudeau said.
The three countries, which have a three-way free trade agreement, closed their borders to non-essential travel for the first time on March 21 as the COVID-19 pandemic was taking hold in North America. It is expected that those details will be released today.
"I fear that the government will try to make it happen in the middle of summer in order to have people not watch it, while they will be having a beer around the barbecue", he said.
Americans who are returning to the US and Canadians who are returning to Canada are exempt from the border closure.
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The restrictions have been extended twice already, for 30 days at a time.
The rules allow for essential business to continue, such as the crossing of transport trucks carrying food and essential goods, but bars non-essential crossings. It has sickened more than 99,000 and killed 8,175 in Canada.
Hundreds have been living in squalid tent camps near the US-Mexico border, which health experts and immigration advocates have said leaves them vulnerable to coronavirus infections.
However, since the beginning of the pandemic, he told reporters his government has been giving the Finance Committee and MPs updates on measures taken every two weeks.
Trudeau said the economy is now moving from an emergency to a recovery phase.
"There's going to be millions of Canadians that have no support in just a couple of weeks and they need to know there's going to be help".