WASHINGTON – The White House criticized Tuesday the concept that Tehran could be constructive in resolving the conflict in Syria, after UN mediator Kofi Annan held meetings with Iranian officials.

“I don’t think anybody with a straight face could argue that Iran has had a positive impact on developments in Syria,” White House spokesman Jay Carney said Tuesday.

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The comment came after weeks of discussion over Iran’s possible role in helping a UN-brokered attempt at a ceasefire in the strife-riven country in which the US has made it clear that it opposes Iranian participation.