Senate approval of the House resolution would set up a showdown with the White House over the president's shifting approach to foreign policy. A veto would be US President Donald Trump's first.
Asserting congressional authority over war-making powers, the US House of Representatives passed a resolution on Wednesday that could force the administration to withdraw US troops from involvement in Yemen, in a rebuke of President Donald Trump's alliance with the Saudi-led coalition behind the military intervention.
Lawmakers in both parties are increasingly uneasy over the humanitarian crisis in Yemen and sceptical of the US partnership with that coalition, especially in light of Saudi Arabia's role in the murder of Washington Post columnist Jamal Khashoggi, a critic of the royal family.
Passage by the Senate would mark the first time Congress has relied on the decades-old War Powers Resolution to halt military intervention. It also would set up a potential confrontation with the White House, which has threatened a veto.
The House voted 248-177 to approve the measure, sending it to the Senate, where a similar resolution passed last year.
"We have helped create, and worsen, the world's largest humanitarian crisis," said Representative Barbara Lee, during the debate. "Our involvement in this war, quite frankly, is shameful," she said.
The chairman of the House Foreign Relations Committee, Eliot Engel, said the vote represents "Congress reclaiming its role in foreign policy."
Senate approval would set up a showdown with the administration — a veto would be Trump's first — over the president's shifting approach on foreign policy.
Lawmakers pointed out that Trump wants to withdraw troops from the wars in Syria and Afghanistan as part of his "America First" approach, but he has shown less interest in limiting the US role in Yemen.
The White House says the House resolution is "flawed" because US troops are not directly involved in military action in Yemen, where the coalition is fighting Iran-backed Houthi rebels in a conflict largely seen as a proxy war involving the Mideast's dominant regional players.
Since 2015, the administration says, the US has provided support to the Saud-led coalition, including intelligence and, until recently, aerial refuelling, but it has not had forces involved in "hostilities."
Congress has not invoked the War Power Resolution, which requires the approval of military actions, since it was enacted in 1973.
Lawmakers approved more sweeping authorisations for the wars in Iraq and Afghanistan that some argue are being used too broadly for other military actions.
Bi-partisan block on Trump
Democrats now control the House and are eager to confront Trump on foreign policy. Republicans in both chambers have shown a willingness to put a legislative check on the president's agenda.
In the House, 18 Republicans, including members of the GOP's libertarian-leaning wing and Trump allies in the conservative Freedom Caucus, joined Democrats in passing the Yemen measure.
Ro Khanna, who drafted the legislation, said there's an emerging bipartisan alliance that's sceptical of military intervention without congressional oversight.
"It's not just about Yemen. It's about the Congress taking a stand and every future president having to think twice about whether to authorize a military intervention without congressional approval," Khanna said in an interview.
The Senate version is from independent Senator Bernie Sanders of Vermont and backed by Utah Republican Senator Mike Lee.
Before Wednesday's vote, the House overwhelmingly agreed to add an amendment offered by Republicans who are seeking to expose emerging Democratic divisions over support for Israel.
The amendment reaffirms the US commitment "to combat anti-Semitism around the world" and says it's in the national security interest to oppose boycotts of Israel. That's a reference to the Boycott, Divest and Sanction movement that has gained the support of some lawmakers.
First-term Representative Ilhan Omar, one of the Muslim-American women elected to Congress, came under criticism this week for her comments against the Israel lobbying organisation AIPAC. She later apologised.
The House added another GOP amendment that would allow continued intelligence sharing, which drew fire from the American Civil Liberties Union.
The ACLU warned it gives the president broad authority to provide the Saudis and others with US intelligence information about Yemen, and the group said the package, overall, is now weaker than originally proposed.
Now the Yemen measure goes to the Senate, where a similar resolution on removing US involvement in the war was approved with Republican support late last year.
At the time, Congress was eager to send a message to both the president and the Saudis after the October 2 murder of the US-based journalist Khashoggi at the Saudi Consulate in Istanbul.
The outcome of the legislation is uncertain. Republicans control the Senate, 53-47, and a simple majority is needed to pass.
Trump has yet to veto any measures from Congress. If he did veto the Yemen resolution, it's unclear whether lawmakers would have enough support to override him.