(July 26, 2017, 9:15 AM EDT) -- WASHINGTON, D.C. — Two Republican congressmen on June 29 sent a letter to the U.S. secretary of the Treasury asking for “a full and complete investigation” into allegations that Russia has used a shell corporation in Bermuda to funnel money to environmental groups that oppose hydraulic fracturing in an effort to influence the U.S. domestic oil and gas industry....