US President Donald Trump said he has proposed the elimination of tariffs in talks at the G7 summit in Canada, as the major industrial nations struggled to resolve differences on trade.

Trump said talks with fellow leaders were "extremely productive" despite tensions over his decision to impose tariffs on steel and aluminium imports. US allies were furious over the move, raising fears of a global trade war. "No tariffs, no barriers. That's the way it should be. And no subsidies. I even said, 'no tariffs'," Trump said, describing his meetings with fellow G7 leaders as positive "on the need to have fair and reciprocal trade".