U.N. nuclear watchdog chief says Iran playing by the rules

By Shadia NasrallaVIENNA (Reuters) - The head of the U.N. nuclear watchdog said on Monday Iran was abiding by the rules set out in a nuclear accord it signed with six world powers in 2015, after Washington suggested it was not adhering to the deal.The State Department must notify Congress every 90 days of Iran's compliance with the deal.The next deadline is October and U.S. President Donald Trump has said he thinks by then the United States will declare Iran non-compliant.