House lawmakers predict their chamber will vote Wednesday to give President Obama authority to arm and train moderate Syrian rebels fighting Islamic militants.

But it won’t come without griping from both sides of the aisle.

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Republicans complained Tuesday that Obama’s plan was ineffective and doesn’t go far enough to decimate terrorist group, the Islamic State in Iraq and Syria, (ISIS), and it’s not clear whether a majority of GOP lawmakers will back it.

“I think there are a lot of folks, especially on the Republican side of the aisle, who don’t have a lot of confidence in President Obama,” conservative Rep. Blake Farenthold Randolph (Blake) Blake FarentholdThe biggest political upsets of the decade Members spar over sexual harassment training deadline Female Dems see double standard in Klobuchar accusations MORE (R-Texas), who will vote yes, said in an interview.

“But I think they’ll vote for it because they see ISIL as a serious threat,” he added, using another acronym for ISIS.

Across the aisle, Democrats were delivering a similar message.

Rep. Jim Moran James (Jim) Patrick MoranLawmakers toast Greta Van Susteren's new show Star-studded cast to perform play based on Mueller report DC theatre to host 11-hour reading of the Mueller report MORE (D-Va.) characterized Obama’s strategy to train the rebels as “highly risky” but predicted it would pass because “there are no better alternatives.”

“It does give authority to the president to pursue a course of action which is going to suck us back into the region,” Moran said. “But I don’t think there’s an alternative. We have too much at stake.”

Moran said it would require “a third to a half of the Democratic Caucus” to pass the measure in the face of GOP defections.

“I think you can probably get that,” the Virginia Democrat said. “Leadership is on board, but they may be ahead of some of their caucus.”

Obama and Minority Leader Nancy Pelosi (D-Calif.), who both rose to power as opponents of the Iraq War, face a daunting task in convincing war-fatigued Democrats to help Republicans pass the White House’s plan to defeat ISIS.

Fears that the U.S. could be drawn into a deeper conflict were fanned by comments on Capitol Hill from Joint Chiefs of Staff Chairman Gen. Martin Dempsey, who told a Senate panel that Obama had ordered him to come back “on a case-by-case basis” to determine if ground troops are necessary for the fight.

Yet in the end, several lawmakers suggest the gruesome images of ISIS members beheading American and British prisoners would likely motivate a bipartisan coalition to vote yes on the plan.

“I can speak for the American people, and I think they are sick and tired of seeing Americans being beheaded by ISIS,” said Rep. G.K. Butterfield George (G.K.) Kenneth ButterfieldCongress must protect kidney disease patients during the COVID-19 pandemic The time for HELP is now: Senate should pass bill to expedite recovery following natural disasters Rep. Clyburn on Confederate statues: Mob action is no answer MORE (D-N.C.). “And they want us to go in there and do what we can to stop the spread of this terrorism. … There’s only 30,000 of them.”

Obama, Vice President Biden and senior administration officials have been bending the ears of both Republicans and Democrats to support the Syria plan. In all, they made more than 60 calls to members since Sept. 9, a White House official said, including to both chairmen and ranking members of the national security committees.

Tony Blinken, the White House deputy national security adviser, attended the House Democratic caucus meeting Tuesday morning to lay out the administration’s plan and address lawmakers’ concerns.

On the GOP side, House Majority Whip Steve Scalise’s (La.) team spent the afternoon huddling in his office to plot strategy and gauge support during roll calls Tuesday. But a GOP aide said Scalise’s whip team was not actively pressuring members to vote for the Syria measure.

House Democratic leaders also do not plan to whip the vote formally, aides said, although Pelosi made her own case for supporting the measure at a caucus meeting Tuesday afternoon.

“Boy, she made a strong argument,” said Rep. Mike Honda (D-Calif.), who remains undecided.

Still, a number of liberal Democrat — including Reps. Charles Rangel (N.Y.), Barbara Lee (Calif.), Lloyd Doggett (Texas) and James McGovern (Mass.) — said they plan to oppose the measure.

“I’m not convinced that what we’re doing is going to achieve the result that people who support it think we’re going to achieve,” McGovern said. “It’s that simple.”

The main complaint from the left on Tuesday was that Congress has not provided the administration broader use-of-force authority in fighting ISIS militants, despite airstrikes ordered by Obama in Iraq.

McGovern said he’s leaning toward opposing both the Syria amendment and the underlying spending bill meant to keep the government open this fall, if the Syria provision is attached.

“My inclination would be to vote no for both,” McGovern said.

The House on Tuesday approved a rule setting up six hours of debate on the Syria amendment and another hour on the underlying funding measure, which would keep the government open through Dec. 11. Six Republicans — Reps. 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.), Kerry Bentivolio Kerry BentivolioIndiana Republican: Leaders duped me Reindeer farmer saves 'cromnibus' with yes vote High drama as .1T spending package advances by one vote MORE (Mich.), Mo Brooks Morris (Mo) Jackson BrooksOvernight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' OVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals,' official says MORE (Ala.), 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.), Walter Jones (N.C.) and Thomas Massie (Ky.) voted against the rule. Five Democrats — Reps. Ron Barber Ronald (Ron) Sylvester BarberKavanaugh nomination a make or break moment to repeal Citizens United Latina Leaders to Watch 2018 Principles and actions mean more than Jeff Flake’s words MORE (Ariz.), Jim Costa (Calif.), Mike Michaud (Maine), Scott Peters (Calif.) and Kyrsten Sinema (Ariz.) voted in favor of it.

Speaker John Boehner John Andrew BoehnerLongtime House parliamentarian to step down Five things we learned from this year's primaries Bad blood between Pelosi, Meadows complicates coronavirus talks MORE (R-Ohio) offered public support for Obama’s plan, but GOP members like Reps. Jeff Miller (Fla.) and Matt Salmon Matthew (Matt) James SalmonCOVID-19's class divide creates new political risks Arizona voters like Kyl but few think he'll stick around Former Sen. Jon Kyl to replace McCain in Senate MORE (Ariz.) have vowed to vote against arming the Free Syrian Army because they’re concerned they simply can’t be trusted. That makes winning support from Democrats all the more critical.

“The Republicans do need our votes to pass it,” House Minority Whip Steny Hoyer (D-Md.) told reporters in the Capitol. “The Democrats are going to have various different views, but my presumption is the CR will pass.”

Across the Capitol, powerful Appropriations Committee Chairwoman Barbara Mikulski Barbara Ann MikulskiForeign policy congressional committees need to call more women experts Lobbying World Only four Dem senators have endorsed 2020 candidates MORE (D-Md.) also predicted the Senate would pass the House’s Syria measure, though some of her Democratic colleagues raised objections.

Sen. Joe Manchin Joseph (Joe) ManchinMomentum growing among Republicans for Supreme Court vote before Election Day Gardner on court vacancy: Country needs to mourn Ginsburg 'before the politics begin' Barrett seen as a front-runner for Trump Supreme Court pick MORE (D-W.Va.), who said he would vote against the Syria measure, noted that billions of dollars spent training the Iraqi army did little to halt ISIS’s advance through northern Iraq. And Senate Majority Whip Dick Durbin Richard (Dick) Joseph DurbinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden Top GOP senator calls for Biden to release list of possible Supreme Court picks MORE (D-Ill.), the No. 2 Democrat in leadership and a close Obama ally, was seeking to amend the House resolution.

“It’s not written as clearly as it should be. We’re talking about going into Syria at this point, which is a dog’s breakfast of violence and terrorism,” said Durbin, the chairman of the Senate Appropriations’ Defense Subcommittee.

Yet even opponents of the Syria amendment conceded that Congress, facing the looming midterms, would very likely pass the measure by week’s end.

“I know I can’t vote for it,” Rangel said. “[But] I think it’ll pass because … I really think that members are more anxious to go home and to get reelected than they are with the constitutional question we’re faced with.”

Alexander Bolton and Justin Sink contributed to this report.