President Obama has committed to trying diplomacy to stop the Iranian bomb. Time, though, is on the mullahs' side, not least because so much of it was wasted after the 2007 U.S. National Intelligence Estimate made the improbable case that Iran had suspended its nuclear weapons program in 2003. This assessment not only contradicted previous U.S. intelligence consensus but -- as recent court documents show -- also the conclusions of a key U.S. ally with excellent sources in Iran -- Germany.

The Bundesnachrichtendienst (BND),...