Secretary of State John Kerry told Congress this week that no one should pre-judge a nuclear deal with Iran because only the negotiators know what’s in it. But the truth is that the framework of an accord has been emerging thanks to Administration leaks to friendly journalists. The leaks suggest the U.S. has already given away so much that any deal on current terms will put Iran on the cusp of nuclear-power status.

The latest startling detail is Monday’s leak that the U.S. has conceded to Iran’s demand that an agreement would...