This won't be a standard party-line vote. Big factions within both parties remain skeptical about President Obama's plans to launch punitive airstrikes against Syria.
If the vote were held today, it might not pass. Obama and his allies — including top House leaders of both parties — have a big selling job yet to do to persuade a majority of members to authorize military action.
Although he says he did not ask Congress to authorize the use of force against Syrian President Bashar Assad's regime "as a symbolic gesture," President Obama reiterated Wednesday that "I always reserve the right and responsibility to act on behalf of America's national security."
President Obama landed in Sweden on Wednesday — the start of a European trip that will take him to Russia for a summit of world leaders at which he'll try to build support for his plan to strike targets inside Syria.
As The Washington Post says, it's a "high-stakes trip ... that could show whether the United States has broad international backing for action."
The White House is working with congressional leaders to shape a resolution that authorizes the type of military action that would send a "clear message" to President Bashar Assad and cripple the Syrian leader's "capability to use chemical weapons not just now but in the future," President Obama said Tuesday.
Sitting with leaders from both major parties, the president also said he is confident lawmakers are "going to be able to come up with something that hits that mark."