Trump, who has been critical of the deal since his election campaign, is expected to announce no later than May 12 whether Washington will remain part of the agreement.
Earlier this month Mr Johnson stressed the importance of keeping the deal "while building on it in order to take account of the legitimate concerns of the US". "But if you do nothing to this deal, if you keep it as is, you will end up with Iran with a nuclear arsenal in a very short time".
When the deal was signed in 2015 during the administration of former US President Barack Obama, the Israeli leader faced opposition to his stance at the White House.
Johnson is visiting the United States in a last-ditch diplomatic push to encourage Trump to not exit the global accord which eases sanctions on Iran in exchange for commitments Tehran will drop its nuclear weapons plan.
Rejoining global markets and banking systems, and rebuilding its economy, were major incentives for Iran to give up its nuclear program.
"In effect, I don't know what Trump will decide because he hasn't told me", the official said on condition of anonymity, making clear Israel had not yet been told of Trump's decision. "We are prepared for all scenarios and no change will occur in our lives next week", Rouhani said in a speech broadcast live on state TV.
'Avengers: Infinity War' Is Still Dominating the Weekend Box Office!
The movie has received positive reviews from critics, with an 84 percent on Rotten Tomatoes , and received an A CinemaScore . The audience score, however, is faring better with a 76 percent.
Trump has gone further, slamming the deal because it doesn't also stop Iran's production of ballistic missiles or its support for militant groups in the Middle East. What happens after the US pulls out?
Iran has said the documents produced by Israel were a rehash of old allegations already dealt with by the UN's nuclear watchdog.
Both German Chancellor Angela Merkel and French President Emmanuel Macron have lobbied Trump directly in recent weeks.
Experts were hoping that a visit from Macron was the best chance to save it, but post his meeting, Macron sounded pessimistic about the deal's fate.
Mr Trump has threatened to withdraw from the Joint Comprehensive Plan of Action (JCPOA) deal signed by the US, China, Russia, Germany, France and Britain with Iran.
Netanyahu displayed visuals and talking points, including the words "Iran lied" in massive black letters.
Local Elections 2018: Tories lose control of Trafford
Welwyn Hatfield's Conservatives have clung onto control of the borough council after a roller coaster election. After 14 years of Tory rule at Trafford Council it went to no overall control.
"These files prove that Iran is overtly lying when it states it needed an atomic weapons system", he said.
He alleged the country then hid the evidence so it has the ability to one day restart the program.
"I said it from the start, it has to be either fully fixed or fully nixed", Netanyahu said. "We have a few days left to see if we can find a way through". "Europe and the United State ought to be in lock step on this".
Rouhani added: "Trump must know that our people are united, the Zionist regime [Israel] must know that our people are united". But he added: "I don't think that Donald Trump wants war". "And on or before the 12th, we'll make a decision".
Trump wants Congress and European powers to fix "disastrous flaws".
"We are honouring our commitment, but we are telling the whole world we will not negotiate with anyone about our weapons and our defence".
Cambridge Analytica closes down amidst Facebook data use scandals
CA came under fire after reports emerged that it had wrongfully obtained the personal data of roughly 87 million Facebook users. About 6 million Pennsylvanians voted in that election, state records show.
According to Taleblu, Netanyahu made a case to pressure Europe into agreeing to strong language on the military inspections issue.