Nikki Haley: U.S. "prepared to do more" in Syria

Nikki Haley told the United Nations Friday the U.S. is prepared to do more in Syria if necessary following Thursday night's air strike. (CNN)

The United States' strike against a Syrian air base might not be the last.

Nikki Haley, U.S. Ambassador to the United Nations and president of the U.N. Security Council, says the United States will not stand by and do nothing when someone uses chemical weapons.

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"The United States took a very measured step last night," said Haley. "We are prepared to do more, but we hope that will not be necessary."

Haley called it a "vital national-security interest" to fight the use of chemical weapons.

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She says Syrian president Bashar al-Assad once again crossed the line of human decency.

"It is time for all civilized nations to stop the horrors that are taking place in Syria and demand a political solution," Haley said.

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Haley also said the Russian government "bears considerable responsibility" for standing by Assad in the past.

"Assad did this because he thought he could get away with it," Haley said. "He thought he could get away with it because he knew Russia would have his back. That changed last night."

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