Influx of migrants presents a political risk for Prime Minister Justin Trudeau

TORONTO - Canada will not tighten its border to deter migrants crossing illegally from the United States in the wake of a US immigration crackdown because the numbers are not big enough to cause alarm, a government minister said.

Public Safety Minister Ralph Goodale said the issue had not risen to a scale that required hindering the flow of goods and people moving across the world's longest undefended border.

Hundreds of people, mainly from Africa and the Middle East, have defied winter conditions and walked across the border, seeking asylum. They are fleeing US President Donald Trump's immigration crackdown, migrants and refugee agencies say.

It is not common to have so many asylum seekers in the US looking for refuge in Canada over such a short period. The influx poses a political risk for Prime Minister Justin Trudeau, who faces pressure from the left, which wants more let in, and from the right, which fears an increased security risk.

"We are concerned and we will deal properly with the extra hundreds (crossing illegally)," Goodale told reporters at a televised news conference in Emerson, Manitoba. "But the full border deals with 400,000 people moving in both directions every day. It also handles C$2.5 billion ($1.9 billion) in trade every day.

"It is critically important for us to make sure that it is strong and secure. At the same time, it needs to be efficient and expeditious."

Emerson, on the North Dakota border, has been overwhelmed by the migration and appealed for more government help to handle the influx.

The Royal Canadian Mounted Police in Manitoba say 183 people have walked across that border in sub-zero temperatures since Jan 1. Goodale said the pace has picked up in recent weeks.

On Jan 25, a White House executive order temporarily banned visitors from seven mainly Muslim countries and also expanded immigration enforcement action domestically.

"The current accelerated rate started in the first week of February and we've been following this very very closely," Goodale said.

Canadian and US officials are working on a plan to tackle asylum seekers crossing into Canada illegally, with US officials keen to discover how they entered the country in the first place. US Homeland Security Secretary John Kelly is to visit Canada this month for talks on the border.

Goodale said it was important for both countries to have the same data and information about the migrants "to fully appreciate where the flow began and all of the factors - and it's not just one factor - that are contributing to the migration".

"We all need to work together. We have to have good communication with one another. This is a set of issues that span national, provincial and local responsibilities," Goodale said.

Goodale announced $22,000 to cover extra costs borne by Emerson-Franklin's volunteer fire department and other agencies in the community, saying more resources will become available.

The RCMP and the Canada Border Services Agency have shifted some resources in southern Manitoba to the Emerson area. The CBSA recently set up a trailer to help process the border-crossers.