CASPER, Wyo. (AP) — Two uranium producers operating in Wyoming are asking President Donald Trump for help in controlling foreign uranium imports.

Energy Fuels and Ur-Energy petitioned the Department of Commerce to look into whether imports from Russia and elsewhere pose a national security risk. The firms are also asking the president to make adjustments to imports of uranium.

About 40 percent of U.S. uranium demand is served by cheaper resources from Russia, Kazakhstan and Uzbekistan, driving down the prices for uranium.

Travis Deti, of the Wyoming Mining Association, says restricting imports from these countries could make Wyoming companies more competitive within the U.S. market.