Rare earth stocks jump after Trump says China holding world 'captive' over the metals, threatens countermeasures
1. Stocks tied to rare earth minerals surged after Trump's countermeasures threat. 2. China imposed stricter export controls on rare earth metals. 3. Rare earths are crucial for U.S. technology and defense sectors. 4. MP Materials, USA Rare Earth saw significant stock price increases. 5. Trump suggested potential tariffs on Chinese imports and other actions.