The price of gold was rising to start the week as heightened uncertainty about U.S. trade policy boosted the appeal of havens.

Continuous gold futures rose by 1.8% to $5,165 per ounce in early trading Monday. Silver futures, meanwhile, rallied 5.1%.

Mining stocks also got a boost— Freeport-McMoRan and Newmont were up 0.5% and 1.2%, respectively.

The jump in gold appears to have been triggered by the U.S. Supreme Court’s decision Friday to annul President Donald Trump’s so-called Liberation Day tariffs.

In particular, the court ruled that Trump broke the law by using the International Emergency Economic Powers Act to place import taxes on the U.S.’s major trading partners.

In response, Trump announced Saturday that he would introduce a global tariff rate of 15%— up 5% from the day before.

“Investors strap back in for another wave of tariff uncertainty,” warned Hargreaves Lansdown equity analyst Matt Britzman.

Market uncertainty triggered by the Supreme Court’s ruling has almost certainly lifted haven demand, boosting prices of precious metals.

Elsewhere, major oil benchmarks Brent crude and WTI were falling early Monday. Oman’s Foreign Minister Badr bin Hamad al-Busaidisaid in a social-media post on Xthat anew round of talksbetween the U.S. and Iran are scheduled for Thursday.