World powers that were party to the agreement, including Britain and France, said those arguments only strengthened the reasoning for the deal, which has safeguards in place created to keep Iran from pursuing nuclear weapons.
"If America leaves the nuclear accord, this will entail historic remorse for it".
It is widely speculated that Donald Trump may decertify the deal when the next renewal deadline comes up on May 12, though members of his administration have said that no firm decision has been made yet, and have urged foreign officials to "fix" the agreement.
Under the 2015 deal struck between Iran, the US, China, Russia, Germany, France and the United Kingdom, sanctions on Iran were lifted in return for curbs on its nuclear program.
Britain, France and Germany remain committed to the nuclear accord but are prepared to open talks on Iran's ballistic missile program, its nuclear activities beyond 2025 and its wars in Syria and Yemen in a bid to keep the United States involved.
Israeli Prime Minister Benjamin Netanyahu recently accused Iran of lying about its nuclear program.
The US president has fiercely criticised the agreement, which eased sanctions on Tehran in exchange for commitments to abandon its nuclear weapons programme.
Although Mr Johnson is not scheduled to discuss the matter with Mr Trump himself, the Republican firebrand will decide whether the United States remains in the nuclear deal on May 12.
"The worst part of the nuclear deal is that it didn't really end Iran's nuclear program", Lieberman said.
The German chancellor, Angela Merkel, and the French president, Emmanuel Macron, have lobbied Trump directly.
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Mr Netanyahu was an outspoken opponent of the deal, which required Iran to limit its nuclear enrichment in exchange for the lifting of global sanctions.
"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.
Recent weeks have seen the hostility between Iran and Israel develop from a secretive conflict to come out into the open.
This week, a senior German official pointed out to me that, "The Iran nuclear deal is the last firewall preventing military tensions in the world's most combustible region from spilling over into thermonuclear war".
The Guardian also says there's no further information about how much work was actually undertaken by the investigators, how long the investigation lasted or what was done with the information compiled.
But the Foreign Secretary is a big proponent of the deal - he has stressed the importance of keeping it "while building on it in order to take account of the legitimate concerns of the US".
It remains unclear what would happen if the United States withdraws from the deal but the other countries remain committed.
Among other things, a plan B would offer Iran economic relief if the U.S. were to re-impose sanctions, conditional on Iran's continued compliance with the JCPOA; and it would provide the basis for a larger strategy of engaging with Iran and other stakeholders to de-escalate regional conflicts.