Top trade negotiators from Canada and the US will meet for a third day ​in Washington on Friday in a ‌bid to finalize a trade deal before new American tariffs due to come into effect on ​Saturday.

Canada's minister responsible for trade with ​the US, Dominic LeBlanc, is due to ⁠meet US Trade Representative Jamieson Greer ​at 10:30 p.m. EDT (1430 GMT), LeBlanc's office ​said in a statement.

LeBlanc met Greer for more than three hours on Thursday and said the two sides ​were "very close" to a deal, but added ​that more work was necessary.

Negotiators are trying to meet ‌a ⁠deadline set by US President Donald Trump, who says he will impose a new 50 per cent tariff on about $20 billion worth of ​Canadian goods ​at 12:01 ⁠am EDT (0401 GMT) on Saturday if a deal is not ​reached.

A deal could mark a detente ​in ⁠what has been nearly two years of tense relations between two long-time allies and major ⁠trading ​partners, and allow broader ​negotiations on renewing the US-Mexico-Canada trade agreement to move ​forward.