A group of House Democrats wants to force a vote to withdraw U.S. forces from the civil war in Yemen, the lawmakers announced on Thursday.

They said that they will introduce a so-called privileged resolution this month if the situation in the war-battered country does not improve that would withdraw the U.S. military from helping the Saudi Arabia-led coalition fighting Yemeni rebels.

“We are preparing to introduce a new, privileged resolution in September invoking the War Powers Resolution of 1973 to withdraw U.S. Armed Forces from engaging in the Saudi-led coalition’s conflict with the Houthis should additional escalations continue and progress fail to be made towards a peace agreement,” the lawmakers said in a joint statement.

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“There has been no specific authorization for the U.S. Armed Forces to engage in hostilities with respect to the conflict between the Saudi-led coalition and the Houthis in Yemen. We must take action to end U.S. participation in this catastrophic war in Yemen and work to bring about a peaceful conclusion to this conflict.”

The effort is being led by Rep. Ro Khanna Rohit (Ro) KhannaThe Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' Congress needs to prioritize government digital service delivery DeJoy defends Postal Service changes at combative House hearing MORE (D-Calif.), who previously led the charge for a House-passed nonbinding resolution that called U.S. military involvement in the war unauthorized.

The statement was co-signed by Rep. Adam Smith David (Adam) Adam SmithWhen 'Buy American' and common sense collide Overnight Defense: Marine Corps brushes off criticism of Marines' appearance in GOP convention video | US troops injured in collision with Russian vehicle in Syria | Dems ask for probe of Vindman retaliation allegations Democrats press Pentagon watchdog to probe allegations of retaliation against Vindman brothers MORE (D-Wash.), the ranking member of the House Armed Services Committee; Rep. Mark Pocan Mark William PocanOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats call for investigation into Pentagon redirecting COVID-19 funds Clark rolls out endorsements in assistant Speaker race MORE (D-Wis.), a co-chairman of the Congressional Progressive Caucus; and Democratic Reps. Jim McGovern (Mass.), Jan Schakowsky Janice (Jan) Danoff SchakowskyAhead of a coronavirus vaccine, Mexico's drug pricing to have far-reaching impacts on Americans With Biden, advocates sense momentum for lifting abortion funding ban Hillicon Valley: Facebook removed over 22 million posts for hate speech in second quarter | Republicans introduce bill to defend universities against hackers targeting COVID-19 research | Facebook's Sandberg backs Harris as VP pick MORE (Ill.), Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (Hawaii), Michael Capuano Michael (Mike) Everett CapuanoHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections 'Markeyverse' of online fans helps take down a Kennedy Inside the progressive hunt for vulnerable House Democrats MORE (Mass.), Yvette Clarke Yvette Diane ClarkeLawmakers call for small business aid at all levels of government The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy The Hill's 12:30 Report - Presented by Facebook - Top tech executives testify in blockbuster antitrust hearing MORE (N.Y.), Ted Lieu (Calif.), Barbara Lee Barbara Jean LeeOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats call for investigation into Pentagon redirecting COVID-19 funds Steph, Ayesha Curry to be recognized by the Congressional Hunger Center MORE (Calif.) and Adriano Espaillat Adriano de Jesus Espaillat CabralLawmakers call for small business aid at all levels of government The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy On the Money: Administration to ban TikTok, WeChat | House moves toward bill to avoid government shutdown | Coronavirus relief bills boosted GDP, CBO says MORE (N.Y.).

The lawmakers announced their plans on the same day the United Nations’ special envoy for Yemen is convening the first formal peace talks in the war in two years.

Yemen’s civil war has raged since 2015, when Iran-backed Houthi rebels took over the capital of Sanaa. Saudi Arabia, concerned about Iran’s link to rebels near its border, intervened on behalf of the internationally recognized Yemeni government.

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The United States does not actively fight in the war, but it supports the coalition with aerial refueling, intelligence sharing and billions of dollars in weapons sales.

U.S. lawmakers’ patience with the Saudi coalition has been wearing increasingly thin as the civilian death toll mounts. The United Nations pegs the civilian death toll at 6,660 as of Aug. 23, a number that is largely blamed on coalition air strikes.

“It’s critical that the United States not choose sides in this war, and any American involvement can and must be debated transparently,” the Democrats said Thursday. “For every Yemeni civilian killed in an airstrike, countless more perish from hunger and disease triggered and sustained by the war. The Saudi-led coalition, and all parties involved, must be held accountable for their actions contributing to this ongoing crisis.”

A United Nations report last month said all parties in the conflict may be responsible for war crimes.

Last month, the coalition struck a school bus, killing 40 children. The incident prompted the rare admission from the coalition that the strike was “unjustified.”

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The State Department said this week that Saudi Arabia’s admission was an "important first step toward full transparency and accountability" while reiterating it “fully supports” U.N. Special Envoy for Yemen Martin Griffiths's efforts to end the war.

As part of the annual defense policy bill signed into law last month, Congress is requiring the administration to certify by Sept. 12 that Saudi and Emirati behavior is helping to end the war, alleviate the humanitarian crisis and protect civilians. If the administration cannot make the certification, it must stop refueling coalition aircraft.

The law allows for a national security waiver to keep refueling aircraft if the certification can’t be made, but the administration still has to submit an unclassified justification to Congress if it grants the waiver.

“As the U.N. attempts to broker a ceasefire, it is imperative that the Saudi-led coalition halt fresh hostilities and planned offensives, particularly in and around the vital port city of Hodeidah,” the Democrats said in their statement Thursday. “We are closely monitoring the actions of the Saudi-led coalition and the White House during these crucial peace negotiations.”