The supreme leader of Iran, Ayatollah Ali Khamenei has confirmed that he supports the initiative by President Rouhani to improve the relationship between Iran and the US.
"We support the diplomatic initiative of the government and attach importance to its activities in this trip," he said in a statement on his website.
But he also said that "some of what happened on the New York trip was not appropriate".
"We are pessimistic towards the Americans and do not put any trust in them," he said.
"The American government is untrustworthy, supercilious and unreasonable, and breaks its promises."