WASHINGTON — Stephen Miller, a top adviser to President Donald Trump, sold shares worth $50,000 to $100,000 in the mining company MP Materials following a July announcement of a lucrative deal between the Las Vegas company and the Trump administration, government filings show.

The sale came one month after the Trump administration announced an extraordinary series of measures to support MP Materials, which produces valuable rare earth minerals and magnets. The deal, which included the government purchasing shares in the company and committing to buy its products, led MP Materials’ share price to skyrocket.

The company’s stock price rose to $45.23 on July 10, the day the deal was announced, from $30.03 a share on July 9. The share price climbed to $76.58 on Aug. 14, the date Miller sold h

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