The president hasn't pulled out of the agreement but decertifying it has serious implications.
Aside from vague threats of violence and suggestions he could 'renegotiate' the Iran nuclear agreement, Donald Trump has provided little in the way of coherent or viable policy options.
Trump seems to think all potential nuclear agitators are alike. He's wrong, and perhaps disastrously so.
The deal will give a much-needed boost to Iran's economy and lend important support to Rouhani's government.
Shared economic and security interests have kept Saudi Arabia and the US close over the decades despite dramatic differences in the way the two countries are governed.
The record donation by Twiggy Forrest highlights the rise of more strategic philanthropy, which tries to tackle the root causes of complex problems through collaboration, research and advocacy.
Trump's tough rhetoric is bad news for Iran's moderates.
Rouhani's conservative rivals are exploiting growing pessimism about the economy, increasing the odds that someone more hostile to the West might become Iran's next president.
Trump has pointed the finger at Obama for creating the list of seven countries in his new travel ban.
This roundup from our archives explains some of the major conflicts unfolding in the seven countries singled out by Trump's executive order.
What the Obama administration achieved with Iran deserves great credit. But can it endure?
The repercussions should Donald Trump withdraw from the Iran nuclear agreement, are detrimental to Iran’s economy, regional stability and US dealings with Europe and Russia.
The outcome of this election may depend more on what we make of it than on what Trump and his advisers intend. Though daunting, the challenge is pregnant with possibilities.
Once seen as a diplomatic victory, the nuclear deal of 2015 is now perceived as a failure by conservatives who reject President Rouhani's message of moderation as economic recovery remains elusive.
The tentative Boeing jet deal prompted outrage among Republicans but barely a peep among Iran's own conservatives, despite their aversion to warmer economic ties with the U.S.
The Iranian president will finally get a parliament that backs his reforms. But much still stands in his way.
Europeans who have travelled to Iran, Iraq, Sudan or Syria now need a visa to travel to the US. Why?
How can the international community be sure Iran is living up to its end of the new nuclear deal?
"Bibi" spits on the very notion that one can deal with Iran, but now one's been done, he's milking it for all it's worth.
The sanctions are being lifted, the economy is opening up – and Tehran's conservatives are furious.