UNITED NATIONS, May 8 (Reuters) - The U.N. Security Council should consider "additional steps" including sanctions if Syria and Hezbollah do not move to resolve a crisis in Lebanon, Washington's U.N. Ambassador said on Thursday.

Ambassador Zalmay Khalilzad said Hezbollah should "operate within the law," stop challenging the legitimate government of Lebanon and support election of a president. He said Syria should delineate its border with Lebanon and establish diplomatic relations with its neighbor.

"Absent those kinds of developments, the council will have to confront these challenges and deal with the problem by taking appropriate steps," he told reporters.

Such steps could be a new U.N. Security Council resolutions or sanctions, he said. (Reporting by Claudia Parsons; editing by Mohammad Zargham)

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