In addition to providing Saudi Arabia with intelligence and flying refueling missions for its air force, the United States has enabled the bombing campaign by supplying $20 billion in weapons over the past 18 months. In total, President Obama has sold more than $115 billion in weapons to the Saudi kingdom – more than any other president.

27 U.S. Senators Rebel Against Arming Saudi Arabia
https://theintercept.com/2016/09/21/27-u-s-senators-rebel-against-arming-saudi-arabia/