The new sanctions against Iran will allow for certain exemptions and waivers to be negotiated, but Mnuchin wouldn't discuss what products or countries might qualify for waivers.
The Treasury secretary said that the sanctions will also sharply curtail sales of oil by Iran, which is currently the world's fifth-largest oil producer. In the case of oil sales, there will be a 180-day period for countries to wrap-up existing contracts and achieve "significant reductions" in their purchases of crude from Iran.
Mnuchin declined to spell out what the administration would consider as a "significant reduction" in purchases of Iranian oil. U.S. law gives the Treasury secretary the power to administer sanctions imposed by the president.
He said he did not expect oil prices to rise sharply because he sees other countries boosting production.
The administration's goal is to impose tough sanctions that will prompt Iran to re-negotiate the Iran nuclear deal, he said.
"These sanctions do impact all the major industries (in Iran). They are very strong sanctions," Mnuchin said. "They worked last time. That is why Iran came to the table."
Mnuchin said that the new sanctions would allow countries doing business with Iran to wind down those activities in either 90 or 180 days, depending on the type of products being sanctioned. He said companies doing business in Iran would not be able to generate new business but would be able to wrap up existing contracts.
"I don't expect we will need more time to deal with these issues," Mnuchin told reporters.
- AP