"In December, the Senate made history by passing this same resolution", Sanders said on Tuesday. "The humanitarian catastrophe has only gotten worse in Yemen, and our intervention there is every bit as unconstitutional as it was then".
In February, the House of Representatives approved on a 248-to-177 vote a resolution condemning US involvement in the conflict. The Senate approved a companion resolution in the previous Congress on a 56-41 vote. That measure died in the House of Representatives, but the Senate will have another opportunity with Wednesday’s vote.
Neither tally came close to the two-thirds majority needed in both houses of the US Congress to override a likely presidential veto.
The intense fighting between the two sides resulted in one of the world's most acute humanitarian crises, with about 22 million people in Yemen currently in need of some form of humanitarian assistance or protection, according to the UN figures.
The Trump administration came under fire last year when the US State Department, for fear of losing some $2 billion in arms sales to the Gulf States, certified that the Saudi-led coalition was trying to avoid civilian deaths. The certification is required by US law to authorize military aid.