Pelosi’s support is important to Democratic President Barack Obama’s push for the nuclear pact to survive congressional review.

“I support the sanctuary” policy, said Pelosi, a Democrat who represents San Francisco.

“I’m very optimistic about our ability to support the president”, Pelosi said. Ending those sanctions is the key US offer to Iran in exchange for curtailing its development of a nuclear weapon.

Under legislation passed overwhelmingly by Congress and signed into law by Obama in May, the House and Senate have 60 days to do nothing and allow the deal to take effect, vote to approve it, or back a resolution of disapproval. To reject the deal, two-thirds of members in both chambers will need to vote against it in order to override a presidential veto.

“So I think that is probably a better model than is being put forth by the Republicans”, she said.

“There is excitement about the fact that President Obama was able to keep P5+1, bring them to the table, and to sustain that engagement for a long period of time to produce an agreement is quite remarkable”, Pelosi said. 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. Secretary of State John Kerry will make multiple appearances to testify on the Hill next week.