Further, the U.S. President is demanding that the so-called "sunset clauses" in the deal be scrapped.
The agreement between Iran and China, France, Germany, Russia, the United Kingdom and the European Union stated that Tehran would end its nuclear weapons program in exchange for lifting of economic sanctions. They say Iran has no reason to agree to a tougher deal without concessions like those that led to the agreement, called the Joint Comprehensive Plan of Action, in the first place.
Writing in the New York Times, Johnson argued "only Iran would gain" from abandoning nuclear restrictions. "I'm not telling you what I'm doing, but a lot of people think they know", Trump said recently.
"We have been talking at senior official level to the administration with our French and German colleagues for several weeks now".
The nuclear deal was struck in 2015 between Iran and Britain, China, France, Germany, Russia and the USA, then led by Barack Obama. The wisest course would be to improve the handcuffs rather than break them. "There could be war", Macron told German weekly magazine Der Spiegel.
Trump can do that without announcing that he is withdrawing from the deal. The president believes the terms of the agreement are too lenient.
Mr Netanyahu told the Israeli Cabinet on Sunday that Iran has delivered advanced weapons to Syria "in order to attack us both on the battlefield and on the home front".
Britain's ambassador to the US said Sunday his country believes it's still possible to address President Donald Trump's concerns about the Iran nuclear deal in time to prevent him from pulling out of the agreement.
"You (U.S.) should know that you can not threaten this great nation because our people withstood eight year of. defence (in the war with Iraq)", Rouhani said in a speech carried live on state television.
Last week, Mr Netanyahu said a "half ton" of Iranian nuclear documents seized by Israeli intelligence revealed that Iran had lied about its past efforts to produce nuclear weapons. Over the weekend, Netanyahu again demanded the world "stop" Iran. Foreign Minister Javad Zarif said the documents produced by Israel were a rehash of old allegations already dealt with by the International Atomic Energy Agency (IAEA), the UN's nuclear watchdog.
"I thought it was a bad deal", he said. "And on or before the 12th, we'll make a decision". We haven't got there yet.
During his two-day visit the Foreign Secretary will meet Vice President Mike Pence, National Security Advisor John Bolton and Congressional foreign policy leaders. He has demanded that "flaws" in the deal be fixed by May 12 or face a US withdrawal.