WASHINGTON, D.C. – Today, U.S. Senators Martin Heinrich (D-N.M.), Dick Durbin (D-IL), Jack Reed (D-R.I.), Gary Peters (D-MI), Amy Klobuchar (D-MN), Tammy Duckworth (D-IL), and Al Franken (D-MN) sent a letter to U.S. Secretary of State Rex Tillerson urging him to attend the North Atlantic Treaty Organization (NATO) meeting of foreign...