REPUBLIKA.CO.ID, WASHINGTON - President Barack Obama on Thursday prepared for the possibility of launching unilateral American military action against Syria within days as Britain opted out in a stunning vote by Parliament. Facing skepticism at home, too, the administration shared intelligence with lawmakers aimed at convincing them the Syrian government used chemical weapons against its people and must be punished.

Despite roadblocks in forming an international coalition, Obama appeared undeterred and advisers said he would be willing to retaliate against Syria on his own.

"The president of the United States is elected with the duty to protect the national security interests in the United States of America," White House spokesman Josh Earnest said.

Even before the vote in London, the US was preparing to act without formal authorization from the United Nations, where Russia has blocked efforts to seek a resolution authorizing the use of force, or from Capitol Hill. But the US had expected Britain, a major ally, to join in the effort.

Top US officials spoke with certain lawmakers for more than 90 minutes in a teleconference Thursday evening to explain why they believe Bashar Assad's government was the culprit in a suspected chemical attack last week. Lawmakers from both parties have been pressing Obama to provide a legal rationale for military action, to specify objectives and to lay out a firm case linking Assad to the attack.

An intelligence report similar to the findings shared with lawmakers Thursday night is expected to be released publicly on Friday.

It was not certain the US would have to act alone. France announced that its armed forces "have been put in position to respond" if President Francois Hollande commits forces to intervention against Syria. Hollande does not need French parliamentary approval to launch military action that lasts less than four months.

Assad, who has denied using chemical weapons, vowed his country "will defend itself against any aggression."

Some of the UN chemical weapons experts will travel directly from Syria on Saturday to different laboratories around Europe to deliver "an extensive amount of material" gathered, UN spokesman Farhan Haq said. While the mandate of the UN team is to determine whether chemical agents were used in the attack, not who was responsible, Haq suggested the evidence — which includes biological samples and witness interviews — might give an indication of who deployed gases.

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