Barack Obama has again weighed into politics on this side of the Atlantic - to defend David Cameron's handling of the economy.
During a joint press conference in the White House, the US President said that the "US and UK economies stand out ... so we must be doing something right".
In what Conservatives believe will be a major boost to Mr Cameron in a general election year, the most powerful man in the world also described the Prime Minister as "great friend" and one of this "most trusted" international allies.
Last year Mr Obama intervened in the referendum campaign, again to support Mr Cameron and other pro-Union politicians.
At that stage he said that the US had an interest in the UK remaining "strong, robust, united", although he added that the decision itself was one for the Scottish people.
The Conservatives hope that this latest meeting between the two men will help show Mr Cameron as a strong leader, a test on which they believe he has a stronger appeals to voters than Labour leader Ed Miliband.
Mr Cameron also revealed that he was helping Mr Obama during his visit to Washington.
The Conservative leader admitted that he was personally lobbying some members of US senate over Iran.
Mr Obama is currently under pressure to increase sanctions to prevent the country, run by Hassan Rouhani, a former student of Glasgow Caledonian University, obtaining nuclear weapons.
During their discussion at the White House the two men agreed that further sanctions could harm current negotiations on that issue with Iran.
Both men also declared that the war against terror could be won in the wake of the recent killing of 17 people in attacks in Paris.
Mr Cameron told reporters "we will come though... but it will take great discipline, great patience and hard work."
The Tory leader has faced ridicule an criticism for his reported request to effectively crackdown on the use of encryption by technology companies.
Mr Cameron wants the White House to exert pressure on internet firms such as Twitter and Facebook to do more to cooperate with Britain's intelligence agencies as they seek to track the online activities of Islamist extremists.
The Lib Dems have called his request "technologically illiterate".
Mr Cameron has also warned that cyber-hackers pose a "real threat" to the UK's economy.
Transatlantic war games are be staged to test resilience, including within some of the UK's largest banks as part of an agreement backed by the Prime Minister and US president.
A report by government listening post GCHQ warns the computer networks of British companies are under attack on a daily basis by hackers, criminal gangs and even foreign intelligence services.
Mr Obama said that the fight was one in the the West would "succeed".
But he said that the US was in a better position than Europe because its Muslim populations felt themselves to be Americans.
"And there is this incredible process of immigration and assimilation that is part of our tradition and is probably our greatest strength... and there are parts of Europe where that is not the case, and that is probably the greatest danger that Europe faces", he said.
He added that it was important for Europe not to "simply act with a hammer" but recognise that integration "is going to be important over time in solving this problem"
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