The Senate passed the amendment by a 70 to 26 vote on Monday.
The amendment was non-binding but reflected widespread support among Democrats and Republicans in the Senate.
It is expected to be included in a broader bill funding continued US support for Israel, Jordan and Syrian opposition groups that the House of Representatives is expected to take up later this week.
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Earlier, the bill to approve funding for Israel, cooperation with Jordan and continue US support for opposition groups in Syria the Senate invoked cloture but did not pass the bill.