If Congress reached a veto-proof majority disapproving of the deal, Obama would be restricted from lifting congressionally mandated sanctions against Iran.

Pelosi said she does not support a GOP proposal to implement mandatory prison sentences for deported illegal immigrants to return to the United States.

Pelosi wouldn’t go so far as to say she thinks her caucus would be able to sustain a veto. Pelosi said that she will actively lobby for the Iran deal and hopes that Congress will review the document in a “thoughtful”, non partisan way. Congressional Republicans have harshly criticized the agreement and are likely to vote against the agreement, which was unveiled on Tuesday. Obama has vowed to veto any legislation that tries to stop the implementation of the global agreement with Iran.

“Mandatory minimum sentences have not been something I have supported”, she said, recalling federal judges who have requested discretion on sentencing matters but noted that a prior Democratic immigration bill had a graduated sentencing structure for repeat offenders. “I’m very encouraged”. Vice President Joe Biden spoke to House Democrats on Wednesday and Senate Democrats on Thursday.

Secretary of State John Kerry, Energy Secretary Ernest Moniz and Treasury Secretary Jack Lew are scheduled to testify before the panel next week.