Gordon Brown has said he "got on very well" with US President George W Bush, after the pair met for the first time in Washington DC on Friday.
Mr Brown told the BBC he discussed global trade with the president in an informal meeting at the White House.
He said he had not expected to meet Mr Bush, who just "happened to be available to come and see me".
The talks are being interpreted as a sign of the US preparing to deal with Mr Brown as Tony Blair's successor.
In an interview with the BBC's Washington correspondent, Justin Webb, Mr Brown said: "We had a general discussion, mainly about trade issues, and I don't think there's anything more to add than that."
He stressed that the UK and US were bound together by "shared values" that had grown up over the past 200 years.
Meanwhile Mr Blair, asked on BBC One's Politics Show whether Mr Bush would get on with Mr Brown, replied: "I'm sure he will, absolutely."
Our correspondent contrasted Mr Brown's "coolness" over the meeting with the warm personal relations Mr Bush and Prime Minister Tony Blair have enjoyed.
He said Mr Bush was deeply unpopular with many left-wing Labour MPs, and the chancellor could be preparing to "recalibrate" relations with the president.
Mr Brown is in Washington meeting finance chiefs from the world's leading industrial nations as a prelude to wider talks in the International Monetary Fund.
Following a conference with his international counterparts, he said they had agreed that "resolving imbalances in the global economy, in a way that is compatible with sustained growth, is a shared responsibility".