TORONTO — Canada is closing its doors to more visitors and temporary residents by approving fewer visas and turning away more people who reach its borders with official documents, according to government data obtained by Reuters.

This surge has placed Canada's visa policies under the microscope, especially as Indian passengers bound for Canada have increasingly sought asylum in the UK during transit.

China said on Tuesday it planned to start an anti-dumping investigation into canola imports from Canada, after Ottawa moved to impose tariffs on Chinese electric vehicles, lifting prices of domestic rapeseed oil futures to a one-month peak.

The move could lead to tariffs on a key Canadian export and escalates a trade fight between the two countries.

China plans to start an anti-dumping investigation into canola imports from Canada, the commerce ministry said on Tuesday, a retaliatory move after Ottawa moved to impose a 100% tariff on imports of Chinese electric vehicles and tariffs on imported steel and aluminium.