The Trump administration’s decision to export material used in missile production to China undermines U.S. national security and should not be allowed to proceed, a group of Senate Democrats said on Monday. “We received your letter informing Congress of the Department of Commerce’s approval to export to [China] over 455,000 pounds of material critical to building missiles,” the senators wrote in an Oct. 5 letter to Commerce Secretary Wilbur Ross. “Any export of material to China that may enable it...