The letter by 47 Senators and members of Congress trying to undermine negotiations between Iran, the United States and the 5 + 1 group is a pretty clear violation of the Logan Act:



"Any citizen of the United States, wherever he may be, who, without authority of the United States, directly or indirectly commences or carries on any correspondence or intercourse with any foreign government or any officer or agent thereof, with intent to influence the measures or conduct of any foreign government or of any officer or agent thereof, in relation to any disputes or controversies with the United States, or to defeat the measures of the United States, shall be fined under this title or imprisoned not more than three years, or both."

Why isn't anyone asking about this and pushing for answers as to how this is not a violation of the law?