Updated at 5:15 p.m. ET
President Obama formally submitted a draft resolutionto both houses of Congress on Saturday. Accordingly, House Speaker John Boehner, R-Ohio, and Senate Majority Leader Harry Reid, D-Nev., both pledged to schedule a vote on the resolution soon after lawmakers return from their recess on September 9.
What happens next, however, is anyone's guess.
Some lawmakers expressed optimism on Sunday that Congress would rise to the occasion and pass the resolution. Others, however, predicted that the resolution would fail, to the detriment of America's image in the world, saying President Obama simply hasn't explained why U.S. intervention in Syria is in America's interest, despite the U.S. government's "" that the regime of Syrian President Bashar al Assad killed over 1,400 civilians in a chemical weapons attack on August 21.
Many lawmakers were unsure, saying administration officials have to make a strong case in the days ahead if they hope to push the resolution through a legislature riven by a matrix of divides - between hawks and doves, Democrats and Republicans, leaders and their rank-and-file.
Dozens of congressmen - about 100, according to several lawmakers present - arrived on Capitol Hill on Sunday to receive a classified intelligence briefing from administration officials who pressed the case for intervention.
Lawmakers who emerged from the briefing, however, were divided on whether they would vote to authorize the use of force.
Rep. Janice Hahn, D-Calif., said there was a "lot of concern" in the room, and that members of Congress seemed to be "evenly divided" over the proposed military action
"I don't know if every member of Congress is there yet. I'm not there yet," she said, wondering whether there's "another way to hold Assad accountable."
Rep. Jim Himes, D-Conn., similarly said he would vote against the current resolution.
Several lawmakers said they needed to hear more information - and see final legislative language - before making a decision.
"I need to hear more," said Sen. Roy Blunt, R-Mo., suggesting the language in the draft resolution may give the president too much latitude in waging war.
"The broad authority the president asked for I think creates lots of concern," he explained, saying the administration is "open on the language issue, and I think they would have to be if they want [Congress' approval]."
Rep. Elijah Cummings, D-Md., said he has a "number of questions that have to be resolved" before he decides how to vote, saying the draft resolution submitted Saturday is "very, very broad."
The Obama administration "presented to Congress a strong case," added Rep. Gerry Connolly, D-Va., but the result "depends on the resolution that ultimately we're asked to vote on."
Rep. Sander Levin, D-Mich., said he would vote in favor of the resolution and predicted it would pass.
"I have confidence that members of Congress will step up to the plate, because if we do nothing, I think it sends a very wrong message," he said. "I think now and then we can go beyond politics, and this is one time we need to."
Sen. Tim Kaine, D-Va., a close ally of President Obama, told CBS News' "Face the Nation" that he's "confident" Congress will rally behind the principle that the use of chemical weapons violates an important international norm.
He also argued coming to Congress was the right thing to do, despite any uncertainty about the outcome.
"We should not be sending servicemen and women into military conflict if they don't have complete confidence that the nation's political leadership is behind them," Kaine said. "And so what this debate in Congress will do is it will educate the American public about the important principles at stake against use of chemical weapons. And it will help them understand, and help Congress come to a consensus about what needs to be done."