
Lewis in a message on his personal twitter expressed satisfaction over attending the ceremony.
Scores of foreign diplomats were present in the endorsement ceremony, he said.
Supreme Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei in a ceremony here on Thursday endorsed the Iranian president-elect, Hassan Rouhani, who won the majority of votes on May 19 presidential elections.
Heads of the three branches of power in Iran, military officials, Ulema, academics and an array of foreign ambassadors and representatives attended the ceremony at Imam Khomeini Mosque in Tehran.
After the president-elect's endorsement by the Leader, he will attend the oath-taking ceremony in Majlis (Parliament) on August 5.
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