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Echoing concerns raised repeatedly by the White House during the past two years — that al-Qaeda-linked militants are operating among the Syrian opposition fighters — Mrs. Ros-Lehtinen added that “too many questions remain about who the rebels are.”

The risks, she said, are simply too great that weapons channeled into the conflict by Washington later could end up being “used against our allies such as Israel or even the United States in a post-Assad era.”

Mrs. Ros-Lehtinen’s remarks appeared almost tailored as a reaction to what has been growing bipartisan support for a measure introduced recently by the Foreign Affairs Committee’s top Democrat, Rep. Eliot L. Engel, of New York, who seeks to give the White House legal authority to arm the Syrian rebels.

⦁ Ashish Kumar Sen contributed to this report.