Legislation granting Congress the power to review a nuclear deal with Iran is facing a life-or-death moment in the Senate.
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Republican Leader Mitch McConnell (Ky.) is seeking an agreement to allow votes on several controversial amendments backed by conservatives that supporters of the bill say would kill it.
To buy more time, McConnell pushed off a planned Monday night vote on a separate labor bill to consult with other Republicans. The full conference is expected to talk about the Iran bill at their Tuesday lunch.