Iranian foreign minister spoke out against the letter sent by 47 U.S. Senators to the Iranian leader, calling it an “unprecedented” and “undiplomatic” move, adding: “Such correspondence tells us that the United States is not trustworthy.”

Mohammad Javad Zarif

Mohammad Javad Zarif

The letter, addressed to Ayatollah Khamenei, indicated that any deal with the Obama administration will only be good until the end of Barack Obama’s presidential term.

Obama had already slammed the letter, accusing the signatories of aligning themselves with extremists in the Islamic Republic establishment.

On Tuesday March 10, Iranian Foreign Minister Mohammad Javad Zarif gave a report on the progress of the nuclear negotiations with the 5+1 to an unofficial gathering of the Assembly of Experts.

He is quoted as saying that the Iranian negotiators have managed in recent months to alter the negative views against Iran through constructive diplomacy.

“Even though negotiations with the Americans has met obstacles due to the presence of extremists in the U.S. Congress, with God’s help and support from the people and our spiritual leaders, we hope to reach a favourable outcome,”Zarif Said.

On Monday the Iranian foreign minister also rejected the central claim of the senators’ letter saying it lacked legal foundation. He stressed that any violation of a possible agreement signed by the United States would be a violation of the country’s international commitments.

The U.S. State Department has announced that the State Secretary John Kerry will meet with Mohammad Javad Zarif on March 15 in Lausanne for another round of talks.