President Donald Trump says he will also impose "reciprocal tariffs" on any countries who place tariffs on the US.

Mr. Trump’s decision to impose tariffs on metals is not new. In his first term, the president levied tariffs on foreign steel and aluminum globally, angering allies like Mexico, Canada and the European Union. He ultimately rolled back some of those barriers on Canada and Mexico when they signed a revised trade agreement with the United States.

President Trump delayed aggressive tariffs on imports from Canada and Mexico, but people close to him warn that more duties are coming—and won’t so easily be averted.

Shares in European and Asian steelmakers fell on Monday after U.S. President Donald Trump said he would introduce 25% tariffs on all steel and aluminium imports within hours in addition to existing metals duties.

Trump said on Sunday he would introduce new 25% tariffs on all steel and aluminium imports into the U.S., on top of existing metals duties, in another major escalation of his trade policy overhaul. Starmer's spokesman said while it was not possible to speculate on the impact of such tariffs without seeing details,

President Donald Trump is expected to introduce new 25% tariffs on Monday on all steel and aluminium imports into the U.S., on top of existing metals duties, in another major escalation of his shake-up of trade policy.