Iranian President Hassan Rohani took the oath of office before parliament in Tehran on Sunday and is expected to name his cabinet later in the day which he says will be chosen from figures across the political spectrum.
Rohani, a relatively moderate cleric, pledged to uphold the constitution and protect the official religion of the Islamic Republic of Iran in a ceremony broadcast live on state television.
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"We believe the United States and the Westerners are seeking an excuse to confront the countries that they do not consider friends," Rohani was quoted as saying.
Rohani formally took office on Saturday at a ceremony in which he received the endorsement of supreme leader Ayatollah Ali Khamenei, who retains the final say on all strategic issues, including the nuclear talks.
Ten heads of state from around the region were due to attend Sunday's parliamentary session, set to start from 1130 GMT, Iranian reports said.
Also present will be former EU foreign policy chief Javier Solana, who has represented world powers in nuclear talks with Tehran in the past.
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