"When we have more information, that answer will become clear," he said when a reporter asked whether it was a matter of when, not if, the U.S. will take military action against Syria.
Asked about U.S. military options on Syria, Hagel spoke in broad terms about the factors Obama is weighing.
"There are risks and consequences for any option that would be used or not used — for action or inaction," he told reporters. "You have to come to the central point of what would be the objective if you are to pursue an action or not pursue an action. So all those assessments are being made."
If the U.S. wants to send a message to Assad, defense officials have previously indicated the most likely military action would be a Tomahawk missile strike, launched from a ship in the Mediterranean.
Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, said in a letter to a congressman last week that the administration opposes even limited action in Syria because it believes rebels fighting the Assad government wouldn't support American interests if they seized power. He said while the U.S. military could take out Assad's air force and shift the balance of the war toward the armed opposition, but that it's unclear where the strategy would go from there.
Dempsey is now in Amman, Jordan, set to meet with Arab and Western peers later Sunday to discuss ways to bolster the security of Syria's neighbors against possible attacks, chemical or other, by Assad's regime, a Jordanian security official said.
The meeting, closed to the press and held at an unspecified location, gathers chiefs of staff from Britain, France, Germany, Italy, Canada, Turkey, Saudi Arabia, Qatar and Jordan, the official said on condition of anonymity because he is not allowed to brief reporters.
Associated Press White House correspondent Julie Pace and Diplomatic Writer Matthew Lee in Washington; National Security Writer Robert Burns in Kuala Lumpur, Malaysia; writer Jamal Halaby in Amman, Jordan, and writer Albert Aji contributed from Damascus, Syria, contributed to this report.
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