Story highlights "He's gonna take that agreement, it's been done before in international context, and then review it," Phares said.

"He will take the agreement, review it, send it to Congress, demand from the Iranians to restore few issues or change few issues, and there will be a discussion," Phares said.

(CNN) Walid Phares, one of Donald Trump's foreign policy advisers, says the President-elect is going to demand changes to the Iran nuclear agreement.

During the campaign, Trump said the Iran deal was one of the worst agreements ever negotiated. In a USA Today op-ed in September of 2015 Trump said, "When I am elected president, I will renegotiate with Iran." Republican members of Congress have sharply criticized the deal since it was announced in 2014.

"Ripping up is maybe a too strong of word, he's gonna take that agreement, it's been done before in international context, and then review it," Phares said on BBC radio Thursday.

"He will take the agreement, review it, send it to Congress, demand from the Iranians to restore few issues or change few issues, and there will be a discussion. It could be a tense discussion but the agreement as is right now -- $750 billion to the Iranian regime without receiving much in return and increasing intervention in four countries -- that is not going to be accepted by a Trump administration," he added.