Canada will continue to accept asylum seekers crossing illegally from the United States but will ensure security measures are taken to keep Canadians safe, Canadian Prime Minister Justin Trudeau said on Tuesday.

The number of would-be refugees crossing into Canada at isolated and unguarded border crossings has increased in recent weeks amid fears U.S. President Donald Trump will crack down on illegal immigrants, and photos of smiling Canadian police greeting the migrants have gone viral.

Opposition Conservatives want Trudeau’s center-left Liberal government to stem the flow of asylum seekers from the United States because of security fears and a lack of resources to deal with them.

“We will continue to accept refugees,” Trudeau told parliament. “One of the reasons why Canada remains an open country is Canadians trust our immigration system and the integrity of our borders and the help we provide people who are looking for safety.