"Congress has played a hugely important role in helping to build our sanctions on Iran but they shouldn't play the spoiler now," she said in a speech to the pro-Israel lobby AIPAC.
Her remarks came ahead of a speech to Congress on Tuesday by Israeli Prime Minister Benjamin Netanyahu, who is expected to argue against U.S. President Barack Obama's Iran strategy. (Writing by Dan Williams and Doina Chiacu; Editing by Eric Walsh)