White House says confident Iran deal will survive in Congress

"We've got some momentum built up on our side," said White House spokesman Josh Earnest at a briefing, referring to the 30 Senators who have publicly announced support for the deal.

Deal supporters need 34 of the 100 senators or 146 members of the 435-seat House to sustain a veto.

(Reporting by Roberta Rampton; Editing by Lisa Lambert)