Iran’s top leader has said that some aspects of Hassan Rouhani’s trip to New York last month were “not appropriate,” but reiterated his crucial support for the President’s policy of outreach to the West.

The comments by Ayatollah Ali Khamenei came after hard-liners criticised a 15-minute phone conversation between Mr Rouhani and US president Barack Obama, a gesture aimed at ending three decades of estrangement between the two countries.

Hardliners, including commanders in the powerful Revolutionary Guard, have said the President went too far in reaching out to the US.

Mr Khamenei also said the US was “untrustworthy.” He has previously said he is not opposed to direct talks with the US to resolve Iran’s nuclear stand-off with the West but is not optimistic.

“We support the government’s diplomatic moves including the New York trip because we have faith (in them),” Mr Khomeini said. “But some of what happened in the New York trip was not appropriate.

“We are sceptical of Americans and have no trust in them at all. The American government is untrustworthy, arrogant, illogical and a promise-breaker. It’s a government captured by the international Zionism network,” said Mr Khamenei, who has final say on all matters of state.

Mr Rouhani’s outreach has received broad support from Iranian legislators and it appears popular, but some including the Guard appear rattled by the pace of developments.

The President went too far in reaching out to the US

The Guard chief commander, General Mohammad Ali Jafari, praised Mr Rouhani recently but called the phone call a “tactical mistake” and said he should have avoided it.

“The respected President, who adopted a powerful and appropriate position in the trip ... would have been better off avoiding the telephone conversation with Obama - in the same way he didn’t give time for a meeting with Obama - and left such measures until after practical, verifiable steps by the US government and a test of their good will,” he said in an interview earlier this week.

The Guard is one of the few institutions capable of standing up and pushing to reverse course and acting as a spoiler if it sees Mr Rouhani going too far and too fast.

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