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Whether the legislation passes with a veto-proof majority will largely hinge on Schumer.
"Senator Schumer is going to be under enormous pressure from the administration and under enormous pressure from his constituents," said Mark Dubowitz, executive director of the Foundation for Defense of Democracies and an expert on the Iran talks.
"He's going to play a pivotal role in determining what happens with the legislation. He's going to be seen as a bellwether for Senate Democrats. Where he goes will matter."
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