MP Materials Corp. (NYSE:MP) stock rose Monday as rare earth stocks advanced following reports of a significant U.S. government investment in rival USA Rare Earth Inc. (NASDAQ:USAR) , underscoring renewed policy focus on domestic critical minerals.Trump Administration’s $1.6 Billion InvestmentThe Trump administration is planning to invest $1.6 billion in USA Rare Earth, marking its biggest investment in the rare earth sector, according to a Financial Times report published Friday. The U.S. government will a ...