On Thursday Ali Akbar Velayati, the foreign policy adviser to Iran's supreme leader Ayatollah Ali Khamenei, warned Tehran would quit the nuclear deal if the United States withdraws.
During Macron's three-day visit to Washington in April, he urged Trump to uphold the 2015 deal between Iran, the USA and other world leaders that had been brokered by Trump's predecessor, President Barack Obama.
"All in all it is a big help for Trump ahead of the May 12 decision".
Trump has called the deal "insane" and said it "never, ever should have been made".
Iran has long claimed that the US isn't fully complying with its side of the deal - a requirement that world powers ease economic sanctions - and that uncertainty about the agreement's future has stymied investment.
"It has weaknesses, certainly, but I am convinced they can be remedied", Johnson wrote.
"We have been talking at senior official level to the administration with our French and German colleagues for several weeks now".
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.
Netanyahu also dismissed experts who said the documents just proved why a deal was necessary.
Meanwhile, those who want to fix the deal, believe that Netanyahu's speech will convince Europe over making a concrete agreement with Trump. He accused Iran supplying advanced weapons to the Syrian government.
As the deadline to make a decision on the fate of the Iran nuclear deal nears, clashes between both the sides has intensified over the U.S. President Donald Trump's possible decision to withdraw from the deal.
The UK-US talks come after Israel revealed "secret nuclear files" accusing Iran of having run a secret nuclear weapons programme, which was reportedly mothballed 15 years ago.
In New York last month, Zarif said that if the USA withdraws, Tehran would seriously consider "resuming at much greater speed our nuclear activities", though he stopped short of threatening to produce weapons.
Prime Minister Binyamin Netanyahu told his cabinet ministers on Sunday, 21 Iyar, that it is best to enter into a confrontation with Iran sooner rather than later. The State Department, Department of Defense, and CIA all say Iran is in compliance and so do the United Nations inspectors at the International Atomic Energy Agency (IAEA). I am sure of one thing: every available alternative is worse.
Trump could decide by May 12 to reimpose USA sanctions on Iran, which had been lifted as part of the agreement.