U.S. may be unable to defend U.S.-backed Syria fighters from Assad
Still, Carter said a final determination has not been made.
"My understanding of that question is that we don't foresee that happening any time soon, but a legal determination, I?m told by the lawyers, has not been made, whether we would have authority to do that or not," he told a Senate hearing.
(Reporting by Phil Stewart, Patricia Zengerle and David Alexander)