Dhaka, Feb. 10 -- US President Donald Trump said on Sunday he will introduce new 25 per cent tariffs on all steel and aluminium imports into the US, on top of existing metals duties, in another major escalation of his trade policy overhaul.

Trump, speaking to reporters on Air Force One on his way to the NFL Super Bowl in New Orleans, said he will announce the new metals tariffs on Monday.

He also said he will announce reciprocal tariffs on Tuesday or Wednesday, to take effect almost immediately, applying them to all countries and matching the tariff rates levied by each country.

"And very simply, it's, if they charge us, we charge them," Trump said of the reciprocal tariff plan.

The largest sources of US steel imports are Canada, Braz...