Canada closed its borders to all foreign nationals except U.S. citizens and permanent residents on Monday, with Prime Minister Justin Trudeau urging people to limit social contact to stem the spread of the new coronavirus.

Several other countries have taken the same step. The 27-nation European Union proposed shutting its external borders for 30 days on Monday.

"We will be denying entry into Canada to people who are not Canadian citizens or permanent residents ... it is a significant step that we take in exceptional circumstances," Trudeau told reporters outside his home, where he is under quarantine after his wife, Sophie, tested positive for the respiratory virus.