Check out the companies making headlines before the bell: Trilogy Metals — U.S.-listed shares of the Canadian minerals explorer soared more than 222% after the White House said it would take a stake in the company . The Trump administration will invest $35.6 million in Trilogy as part of a new partnership, making the U.S. government a 10% shareholder. Aehr Test Systems — The stock plunged 20% after the semiconductor testing solutions firm reported a year-over-year drop in revenue and declined to issue guidance due to global trade tensions. Dollar Tree — Shares fell 4% after Jefferies downgraded the discount retailer's stock to underperform from hold. The firm also called for a 20% drop in Dollar Tree. Advanced Micro Devices — The chipmaker's stock rose nearly 4% after a Jefferies upgrade t

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