A Twitter account associated with Iran's Supreme Leader Ayatollah Ali Khamenei hit out on Thursday at a letter by Republican senators threatening to undo any nuclear deal between Washington and Tehran, saying the U.S. "has a habit of a deception and treason."
The letter signed by 47 Republican senators warned Iran that any nuclear deal made with President Barack Obama could last only as long as he remained in office — an unusual intervention into U.S. foreign policy-making.
Khamenei is the ultimate authority on all Iranian matters of state. Some of the Thursday's tweets used #IranLetter and #IranTalks.
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The White House has described the GOP's letter as "reckless" and "irresponsible," saying it interfered with efforts by six major powers to negotiate with Iran on a deal to prevent it from building a nuclear bomb.
Secretary of State John Kerry, Washington's chief nuclear negotiator, voiced "utter disbelief" at the senators' action, saying the notion that they could alter any executive accord between government leaders was "flat wrong."
The Islamic Republic dismisses Western suspicions that it aims to develop nuclear weapons, saying its atomic energy program is only for peaceful purposes.
Another of the tweets called accusations that Iran is linked to terrorism "cheap and despicable."