Trump's new proposal calls for a 10 per cent tariff on $200 billion in goods, and Beijing said it would respond with "comprehensive measures." It doesn't import enough goods from the US to match the scale of Trump's proposal but could adopt other methods.
The Dow traded as 24,617 as of 10 am Eastern time. The S&P 500 index gave up 26 points, or 1 per cent, to 2,746. The Nasdaq composite fell 89 points, or 0.8 per cent, to 7,658.