President Donald Trump plans to impose 25% tariffs on all imports of steel and aluminum into the US, broadening his trade salvo and threatening ties with some of the country’s top trading partners.

U.S. Steel surged 15% in premarket trading; Cleveland-Cliffs jumped 11%; Nucor rose 9%; Alcoa rose 5%.

Trump, speaking to reporters Sunday on Air Force One, said the tariffs would apply to imports of the metals from all countries. Asked whether major suppliers Mexico and Canada would be included, he said the levies would cover “everybody.” He didn’t specify when the duties would take effect.

The president also said he would announce reciprocal tariffs this week on countries that tax US imports. Those would be enacted “almost immediately” after an announcement, Trump said, without providing further detail.

Sunday’s move is Trump’s latest in a series of threatened tariffs on countries and specific sectors that have rattled markets in recent weeks. Yet it’s uncertain whether he’ll follow through — he announced, then paused, tariffs on Canada and Mexico, while proceeding with levies on China.

The US relies on aluminum imports from countries including Canada, the United Arab Emirates and Mexico, to meet the vast majority of demand — net imports added up to more than 80% in 2023, according to Morgan Stanley. Steel imports account for a smaller portion of overall consumption, but are vital for sectors leaning on specialty grades, including aerospace, auto manufacturing and energy, from wind developers to oil drillers.