By Patricia Zengerle
WASHINGTON, May 13 (Reuters) - U.S. Senate Republicans on Wednesday blocked the latest Democratic-led effort to end the Iran war until it is authorized by Congress, but the measure edged closer to passage as a third Republican voted to advance the bill.
The Senate voted 50-49 not to advance the war powers resolution, nearly along party lines. Three Republicans joined every Democrat but one in backing the measure sponsored by Senator Jeff Merkley of Oregon.
