Pressure is growing on GOP leaders to have Congress authorize ongoing military operations in the Middle East.

Dozens of House lawmakers, representing both parties, sent a letter to Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) on Friday urging him to debate a new resolution providing authorization for the use of military force (AUMF) in Syria and other terrorist hotspots.

Led by Reps. Jim McGovern (D-Mass.) and Tom Cole (R-Okla.), the lawmakers say Congress is ducking its constitutional responsibility to provide the Pentagon with the green light to continue fighting Syrian forces and terrorists aligned with the Islamic State in Iraq and Syria (ISIS).

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“[President Trump] must seek approval from Congress before taking any further military action against the Syrian regime of [President] Bashar al-Assad,” the lawmakers wrote. “As you know, we represent a diverse group of political views, but on this matter we are united.

“We believe that Congress has an important role to play, and based on current events, such a debate should occur as soon as possible.”

Reps. Walter Jones (R-N.C.) and Barbara Lee (D-Calif.) also helped spearhead the letter, which was endorsed by 46 House lawmakers. Most are Democrats, but a handful of Republicans are joining the push. Aside from Cole and Jones, the list includes GOP Reps. Thomas Massie (Ky.), Paul Gosar Paul Anthony GosarPelosi must go — the House is in dire need of new leadership LWCF modernization: Restoring the promise Trump tweets his people have all left Drudge MORE (Ariz.), Ted Yoho Theodore (Ted) Scott YohoKat Cammack wins Florida GOP primary in bid for Ted Yoho's seat The Hill's Convention Report: Democrats gear up for Day Two of convention Eyes turn to Ocasio-Cortez as she seeks to boost Biden MORE (Fla.) and Justin Amash Justin AmashOn The Trail: How Nancy Pelosi could improbably become president History is on Edward Snowden's side: Now it's time to give him a full pardon Trump says he's considering Snowden pardon MORE (Mich.).

Ryan has signaled a recent openness to debate a new AUMF. After Trump fired scores of missiles at a Syrian air base last month — a strike initiated in response to chemical attacks on civilians — the Speaker’s office said that, while the president was within his authority to launch that strike, the administration should confer with Congress before escalating the fight.

“It is now appropriate for the administration to consult with Congress as it considers next steps to resolve the long-running crisis in Syria,” a Ryan spokeswoman said at the time.

But Ryan refused the Democrats’ entreaties to cut short Congress’s spring recess to launch the AUMF debate, and the issue has been put on the back burner this week, when returning lawmakers focused much of their energy on legislation to fund the government and prevent a shutdown.

But ignoring the AUMF issue cannot be an option, the bipartisan group wrote to Ryan. The lawmakers argue that the current use-of-force resolution, passed in 2001 in response to the 9/11 attacks, is outdated and no longer applies to a fight that’s expanded geographically and targets a different enemy.

“For too long, the United States has conducted military operations against the Islamic State under the justification of the outdated 2001 Authorization for the Use of Military Force (AUMF). The U.S. has steadily escalated its role and military presence against the Islamic State forces in Syria and Iraq, including additional deployments over the past two months. It is past time for the House to debate and vote on an AUMF that defines the purpose, nature and limits of U.S. military engagement against the Islamic State,” they wrote.

“Congress cannot continue to remain silent and ignore its responsibilities under the Constitution,” they added. “Engaging in these debates is the minimum we owe the American people and our brave men and women in uniform.”

Ryan’s office did not respond Friday to a request for comment.