He said the US will continue to negotiate with India and the seven other countries receiving the six-month exemption to get them to cut their Iranian imports to zero.
In July, US President Donald Trump announced he was pulling out of the nuclear deal signed in 2015 by the five permanent members of the United Nations Security Council, Germany and the European Union with Iran to end its nuclear weapons programme.
Trump said the sanctions that had been lifted after the agreement would be reimposed and the oil trade would be targeted starting Monday.
Pompeo said that an important reason for the reimposition of the sanctions was Iran's promotion of terrorism and that it was aimed at curbing its "revolutionary" policies.
Since the reimposition of sanctions were announced, India has been cutting back on the Iranian imports.
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