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Newt Gingrich said that President Donald Trump decided to "decertify" the Iran nuclear deal because the administration understands that Iran has long been the United States' "mortal enemy."

"I always ask my liberal friends: What do you think the term 'Death to America' means?'" Gingrich said on "Outnumbered."

He said that Trump and his national security team methodically thought this through, and they arrived at the correct decision.

He said he expects Trump to adopt a more aggressive strategy toward Iran, including targeting the Revolutionary Guard, the nation's most powerful security institution.

"And that is going to enrage the Iranians," Gingrich said. "They've bluffed Westerners over and over again, starting with Jimmy Carter in 1979. And now - just like the North Koreans - they're running into somebody who's not bluffable."

He said he expects the Iranians to have a strong reaction, but the administration - with experienced generals like Secretary of Defense James Mattis, Chief of Staff John Kelly and National Security Adviser H.R. McMaster - is ready to respond to any aggression.

"They have zero doubt this is a bad regime," Gingrich said. "And I think we will respond as aggressively as we need to to whatever the Iranians do."

Watch more above.

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