Trump officials remain on course to hit Canada and Mexico with 25% tariffs on March 4, with a wave of other levies ready to roll.

The president also said he would impose an additional 10 percent tariff on China as he tries to force other countries to take more action on drug shipments.

Finance ministers and central bankers from the G20 top economies gather in South Africa on Wednesday and Thursday, for a meeting marred by the absence or curtailed attendance of key members and disputes over the main issues of climate, debt and inequality.