"My number one priority is to dismantle the disastrous deal with Iran. I have been in business a long time. I know deal-making and let me tell you, this deal is catastrophic - for America, for Israel, and for the Middle East," he said.
"The problem here is fundamental. We have rewarded the world's leading state sponsor of terror with USD 150 billion and we received absolutely nothing in return," he said in an address yesterday to the annual conference of the powerful American Israeli Political Action Committee (AIPAC).
But when those restrictions expire, Iran will have an industrial-size military nuclear capability ready to go, and with zero provision for delay no matter how bad Iran's behaviour is, he said.
The deal is silent on missile tests but those tests do violate UN Security Council Resolutions and no one has done anything about it, he said as he went on to slam the UN.
"Secondly, we will totally dismantle Iran's global terror network. Iran has seeded terror groups all over the world. Third, at the very least, we must hold Iran accountable by restructuring the terms of the previous deal," Trump said.
Laying out his vision of US-Israel relationship, the real estate tycoon vowed that as American president, he would work to destroy the alleged global terrorist network of Iran and prevent it from acquiring nuclear weapons.