
State Department officials said Tuesday the letter would be sent shortly before Kerry delivers what is being billed as a major policy speech on the Iran agreement in Philadelphia. The officials said the speech, a week before Congress returns to work, will focus on how the deal makes the US and its allies safer.
Kerry will also attack what the officials said is a “mythology” of false claims about what the deal will do. The officials spoke on condition of anonymity because they were not authorized to preview the speech by name.