The major U.S. stock indexes opened lower on Tuesday, as U.S.-China trade tensions were in focus. On Friday, markets fell dramatically after President Donald Trump threatened to impose new tariffs on Chinese imports.

Stocks jumped Monday after President Trump said "all will be fine" with China, easing investor fears about his threat to add a new 100% tariff on the country's imports.

MP Materials (NYSE:MP), an American company specializing in rare-earth materials and based in Las Vegas, Nevada, experienced a stock increase of approximately 8% on Friday after China revealed new export restrictions on rare-earth elements.

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China stocks are set to come under pressure on Monday as the renewed trade war between Washington and Beijing hits risk appetite and spurs profit-taking in a share market hovering near its highest level in a decade.