On Tuesday, Earnest told reporters the Corker-Mendez bill includes a poison pill provision that would make an agreement contingent on Iran renouncing terrorism.
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The White House is trying to bottle up bipartisan legislation that would give Congress 60 days to review a final Iran nuclear deal.
The pushback may be having an effect — Sen. Chris Coons, a Democrat from Delaware, is now undecided about the legislation after Republicans had touted him as a supporter.
Coons is worried Republicans might use the bill as a political weapon, something the White House has warned about.