The U.S. Senate voted Tuesday afternoon on to block the resolution aimed at stopping the sale of an estimated $510 million in precision-guided munitions, part of Trump's proposed $110 billion arms package to Riyadh.
But opponents of the deal, led by Sen. Chris Murphy, a Connecticut Democrat, and Sen. Rand Paul, a Kentucky Republican, are critical of Saudi Arabia's role in Yemen's civil war. They fear the sophisticated weapons could be used in the conflict and have crafted a resolution of disapproval to derail the deal.
Paul, who challenged Trump for the GOP presidential nomination as a leader of the party's non-interventionist wing, sharply criticized Saudi Arabia during remarks on the Senate floor. He said the munitions sale threatens the lives of innocent Yemenis.
"Today I stand up for the thousands of civilians who are being killed in Yemen," Paul said. "Today I stand up for the millions of voiceless children in Yemen who will be killed by the Saudi blockade. Today I stand up for saying we, the United States, should no longer be fueling the arms race in the Middle East. It's come to no good."
Senate Majority Leader Mitch McConnell, R-Ky., and other senators supporting the sale said the United States can't deny its Middle East allies the weapons they need to combat Daesh terrorists and check Iran's aggression in the region.
The war in Yemen is pitting the country's internationally recognized government and a Saudi-led coalition against the Iranian-backed Shiite militants known as Houthis, who are allied with army units loyal to a former president. The Saudi-led coalition, which is supported by the United States, has been carrying out airstrikes in Yemen since March 2015 and thousands of civilians have been killed in the fighting, according to the U.N.
Sen. Lindsey Graham, R-S.C., said rejecting the sale of precision munitions to Saudi Arabia would be a victory for Iran.
"If you don't think containing Iran and keeping them from toppling Yemen, Iraq, Syria (and) Lebanon is not in our national interest, you're making a huge mistake," he said.
Trump's decision to move ahead with the sale appeared to reverse an Obama administration decision to hold sales of precision-guided munitions to Saudi Arabia's armed forces after a Saudi air strike on a funeral in Yemen last year killed more than 140 people.