For the first time, and against a rising death toll in Yemen, the U.S. Senate is using new oversight powers to track American weapons sales to Saudi Arabia, Foreign Policy has learned.

The move signals a growing unease on Capitol Hill with the Saudi-led war effort against Houthi rebels in Yemen, a conflict the United Nations says has killed more than 5,700 people and has forced another 2.3 million from their homes.

The oversight effort, initiated by the two senior members of the Senate Foreign Relations Committee, follows an intense lobbying push by U.S.-based humanitarian aid groups opposed to the pending sale of nearly $1.3 billion in bombs and other warheads to Riyadh. The State Department approved the tentative sale last month and it is expected to clear congressional hurdles this week. […]