The leaked memo written by Sir Kim Darroch, UK's former ambassador to the United States, reveals that Trump's decision to scrap the Iran nuclear deal was meant to spite Obama.
Former chancellor George Osborne has criticised Scotland Yard for encroaching on press freedom by launching a criminal investigation into the leak of diplomatic dispatches sent by Britain's USA ambassador Sir Kim Darroch.
In May 2018, Britain's then-foreign minister Boris Johnson went to Washington to try to persuade Trump not to abandon the Iran deal.
'There is no threat to national security ... it's embarrassing but it is not a threat to national security'.
In a cable sent afterwards, Darroch indicated there were divisions in Trump's team over the decision, and criticized the White House for a lack of long-term strategy.
"None of the three could articulate why the President was determined to withdraw, beyond his campaign promises", he wrote.
Trump did not directly address his change of tone on Friday, but said "some people just told me. he actually said very good things about me".
The newspaper reported that, according to Darroch, Pompeo also hinted that he had tried but failed to "sell" a revised text to Trump.
In 2015, the United States, China, Britain, France, Russia and Germany signed a deal with Iran to limit its nuclear programme in exchange for a partial lifting of global economic sanctions.
It says the memo was written after the-then Foreign Secretary Boris Johnson appealed to the USA in 2018 to stick with the nuclear deal.
Tensions between the United States and Iran has been high ever since Donald Trump pulled out of the Iran nuclear deal and accused the country of illegally enriching uranium.
A first batch of leaked reports authored by Darroch last weekend caused major turmoil between Britain and its closest ally.
President Trump hit back and denounced him as a "very stupid guy" and a "pompous fool", vowing he would never work with him in his position as ambassador.
Johnson pointedly refused to back Darroch during the televised debate on Tuesday, leading to accusations from fellow Conservative Party MPs that he had thrown the ambassador "under the bus" in order to bolster his own ties with Trump.
"We are, however, a body charged with enforcing the law, and we have received legal advice that has caused us to start a criminal inquiry into the leak of these specific documents as a potential breach of the Official Secrets Act (OSA)".
Neil Basu issued the warning in a statement a day after announcing that Scotland Yard's counter-terrorism office had launched a criminal investigation spurred by the recent unauthorized publication of official memos written by Mr. Darroch, a a career British diplomat who subsequently resigned this week as the British ambassador to the U.S.