No. 2 U.S. House Democrat will support Iran nuclear deal

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House Democratic leader Nancy Pelosi, who supports President Barack Obama's efforts to win congressional approval of the Iran deal, has predicted that Republican attempts to cripple the agreement will fail.

It was not yet clear how many undecided House Democrats will be swayed by Hoyer's announcement. Out of the 188 Democratic members of the House, about 120 have said they would back the deal and about 50 were undecided as of early Wednesday.

(Reporting by Richard Cowan and Patricia Zengerle; Editing by Susan Heavey)