tariffs
The prime minister refused to rule out retaliatory measures amid fears of a global trade war.
The US president has imposed a 25% import tax on steel and aluminium industries around the world.
While White House press secretary Karoline Leavitt sounded sure that tariffs wouldn't hurt Americans, most economists believe they'll end up costing consumers more.
The president's remarks contradict those of his own commerce secretary, who said Americans should "absolutely not" brace for a recession this year.
Stock markets sank on Tuesday as the Trump administration implemented new tariffs against Canada and Mexico.
The president insists "it's gonna go well."
The UK will adopt a "wait and see" approach, according to Pat McFadden.
President Donald Trump has rolled out his plan to increase US tariffs to match the tax rates that other countries charge on imports.
The president spoke out at he outlined plans to slap tariffs on all steel exported to the US.
His comments have already sparked international concern.