Futures tracking aluminum and steel prices in the US surged after President Donald Trump said he will double tariffs on the metals this week.Contracts linked to the prices that manufacturers pay to get aluminum delivered to the US Midwest jumped 54% to the highest since at least 2013 on the Comex exchange in New York on Monday — offering an early glimpse of the much higher costs for American factories,

U.S. President Donald Trump plans to double tariffs on steel and aluminium imports to 50% from Wednesday, stepping up pressure on global steel producers and deepening his trade war.