JACKSON, Wyo. \u2014 U.S. Senators Mike Enzi and John Barrasso, both R-Wyo., sent a letter urging the Trump administration to support the development of a fully domestic rare earths supply chain and reduce U.S. dependence on foreign minerals that are critical for manufacturing our defense technologies and supporting national security. In a letter sent to Secretary of Defense Mark Esper and Secretary of the Interior David Bernhardt, the senators wrote: \u201cIt is clear that our dependence on China for vital rare earths threatens our U.S. manufacturing and defense industrial base.\u00a0As the October 2018 Defense Industrial Base (DIB) Report states:\u00a0\u2018China represents a significant and growing risk to the supply of materials deemed strategic and critical to U.S. national security.\u2019 Ensuring a U.S. supply of domestically sourced rare earths will reduce our vulnerability to supply disruptions that poses a grave risk to our military readiness.\u201d The letter was led by U.S. Senator Ted Cruz, R-Texas. It was also signed by U.S. Senators Tom Cotton, R-Ark., Cory Gardner, R-Colo., and Martha McSally, R-Ariz.