Four U.S. senators introduced a joint resolution on Thursday seeking to block the U.S. sale of $1.15 billion of Abrams tanks and other military equipment to Saudi Arabia, citing issues including the conflict in Yemen. The measure was introduced by Republican Senators Rand Paul and Mike Lee and Democrats Chris Murphy and Al Franken, the latest indication of strong disapproval of the deal among some U.S. lawmakers. "Selling $1.15 billion in tanks, guns, ammunition, and... (GunPolicy.org)