In a hard-hitting speech from the White House on Friday, Trump condemned Iran as a "fanatical regime" and said it has "committed multiple violations" of the nuclear deal which among other things allows Tehran to continue and advance its nuclear weapons programme.
Trump announced that he would not continue to certify the agreement to Congress, but stopped short of immediately cancelling US participation in the deal and left its fate in the hands of Congress.
"That's why he (Trump) took the decision, let's see if we cannot address the flaws in the agreement by staying within the agreement, working with the other signatories, working with our European friends and allies within the agreement," he said.
The Secretary of State alleged that there have been a number of technical violations of the Iranian nuclear deal -- carrying too much inventory of heavy water, having materials that are used to construct high-speed centrifuges.
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"Our response to that has been to work with the other parties and demand that we be much more demanding of the enforcement of the agreement, much more demanding inspections, much more demanding disclosures. And that's what we are shifting since we have taken our seat at the table of the joint commission," the top American diplomat said.
"For too long, and certainly the last administration really defined the Iranian relationship around this nuclear agreement. This nuclear agreement is flawed. It has a number of weaknesses in it," he said.
The president said throughout his campaign even, that he will either reform the agreement, either fix these flaws, or will have to have a different agreement entirely. His decision around the new policy is consistent with that, he said.
"Now we want to deal with the nuclear agreement's weaknesses, but we really need to deal with a much broader array of threats that Iran poses to the region, our friends and allies, and, therefore, threats that they pose to our own national security," he said.
There is the nuclear agreement, which the US is going to undertake an effort to see if they cannot address the many flaws in the agreement, working with partners.
"It may be a secondary agreement. Maybe it's not within the existing agreement, but we may undertake a secondary agreement," he said, adding that there's a much broader array from threats from Iran, its ballistic programmes, its support of terrorist groups in the region, Lebanese Hezbollah, Hamas.
These are all very threatening organisations, he said.
The third element of this policy is about the regime in Iran, this revolutionary regime that, ever since it came to power, has been intent on killing and harming Americans and harming others in the region.