The US-Canadian border is being closed to all non-essential traffic to combat the spread of coronavirus.
The ban means travellers will no longer be permitted to cross the border for recreational purposes and tourism for the foreseeable future.
Canadian Prime Minister Justin Trudeau says trade between the two countries will not be affected, and that essential travel will continue.
“Our governments recognise that it is critical that we preserve supply chains between both countries. These supply chains ensure that food, fuel, and life-saving medicines reach people on both sides of the border,” Mr Trudeau has told reporters.
US President Donald Trump says the agreement is by mutual consent.
“I spoke with the Prime Minister Trudeau – [there is a] very good relationship obviously between us and our two countries, and no tipping point. It’s just that we want to isolate from the standpoint [that] we don’t want people coming into contact, because that’s the way we’re going to win this war. That is so important,” says Mr Trump.