WASHINGTON - President Barack Obama is seeking time before deciding whether Syria's probable use of chemical weapons will force the United States off the sidelines of a two-year conflict that he has never seen as a central national security threat.
"What we have right now is an intelligence assessment," Obama said Friday, in his first comments on Syria since the White House acknowledged Thursday that Syria's government probably used chemical agents "on a small scale." But he stressed that it is too soon to say whether the "red line" of chemical weapons use was crossed.
"Knowing that, potentially, chemical weapons have been used inside of Syria doesn't tell us when they were used, how they were used," or provide "confirmation and strong evidence," Obama said before a White House meeting with Jordan's King Abdullah II, who is urging a more forceful U.S. response to the worsening civil war on his border.
"This is going to be a long-term proposition. This is not going to be something that is solved easily overnight," Obama said.
For months, the administration has warned Syrian President Bashar Assad not to use chemical weapons in his struggle against opposition fighters. Obama has talked tough about what could trigger a U.S. response with "enormous consequences," but he has never spelled out what those consequences might be.
White House press secretary Jay Carney reiterated Friday that Obama "retains all options to respond" if further information proves the suspected use of the nerve agent sarin.
The definitive proof the White House is seeking is likely to be weeks or months in the offing, if it comes at all. A U.N. weapons team has been blocked from on-the-ground testing, and it is not clear what other scientific or intelligence information the White House would find persuasive.
Last month, U.N. Secretary General Ban Ki Moon appointed a 15-person team to inspect sites in Syria where chemical weapons might have been used. But the team has been cooling its heels because Assad refuses to grant access to all of the locations, and U.N. diplomats see no end in sight to the stalemate.
Efforts to take a tougher line on Syria by the United States and its allies at the United Nations have been blocked by Russia, which remains an Assad ally.
The United States is under pressure to do more from several Arab states, along with Turkey, Israel and prominent European allies. There is no consensus about what those nations want from Obama, but there is little pressure from the American public for military involvement.
The White House followed allies Britain, France and Israel in concluding that chemical weapons were probably used by the Syrian regime over the past four months, but it added the caveat that the assessment was reached "with varying degrees of confidence."
"We're going to be working with countries like Jordan to try to obtain more direct evidence and confirmation of this potential use," Obama said Friday. "In the meantime, I've been very clear publicly but also privately that for the Syrian government to utilize chemical weapons on its people crosses a line that will change my calculus and how the United States approaches these issues."
Capital focus of fighting
Fighting between government forces and rebels dragged on Friday in the capital. Troops pushed into two northern neighborhoods of Damascus, triggering heavy fighting with rebels, activists reported. The drive was the latest in a dayslong offensive by government forces in and around the capital, an apparent bid to secure President Bashar Assad's main stronghold against rebel challenges.