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Washington • President Barack Obama's request for speedy congressional backing of a military strike in Syria advanced Wednesday toward a showdown Senate vote, hours after the commander in chief left open the possibility he would order retaliation for a deadly chemical weapons attack even if Congress withheld its approval.

A resolution backing the use of force against President Bashar Assad's government cleared the Senate Foreign Relations Committee on a 10-7 vote after it was stiffened at the last minute to include a pledge of support for "decisive changes to the present military balance of power" in Syria's civil war. It also would rule out U.S. combat operations on the ground.

The measure is expected to reach the Senate floor next week, although the timing for a vote is uncertain. Sen. Rand Paul, a Kentucky conservative with strong tea party ties, has threatened a filibuster. Seven Democrats and three Republicans supported the measure, while two Democrats and five Republicans opposed. Among Republicans, opposition came from lawmakers with the closest ties to tea party activists, including Paul and Florida Sen. Marco Rubio, both presidential aspirants.

The House also is reviewing Obama's request, but its timetable is even less certain.

The administration blames Assad for a chemical weapons attack that took place on Aug. 21 and says more than 1,400 civilians died, including at least 400 children. Other casualty estimates are lower, and the Syrian government denies responsibility.

The Senate panel's vote marked the first formal response in Congress, four days after Obama unexpectedly put off an anticipated cruise missile strike against Syria last weekend and instead asked lawmakers to unite behind such a plan.

Secretary of State John Kerry said he believes Obama will address the nation on Syria in the next few days.

Obama's request also received its first hearing in the House during the day, and Kerry responded heatedly when Rep. Jeff Duncan, R-S.C., said that Kerry, Obama and Vice President Joe Biden all had advocated for caution in past conflicts. "Is the power of the executive branch so intoxicating that you have abandoned past caution in favor of pulling the trigger on a military response so quickly?" Duncan asked.

Kerry, who fought in Vietnam in the 1960s and voted to authorize the war against Iraq a decade ago, shot back angrily: "I volunteered to fight for my country, and that wasn't a cautious thing to do when I did it."

When Duncan interrupted, Kerry said, "I'm going to finish, congressman" and cited his support as senator for past U.S. military action in Panama and elsewhere. —

More on Syria

More about Russia's reaction and Obama's red line. › A6, A7