Manchester, UK - New UK Prime Minister Andy Burnham has said he may "take a different opinion" from Donald Trump and will "put Britain's interest first" when dealing with the American president.

In excerpts released Sunday of a BBC interview conducted Friday, Burnham said his first call with Trump held just hours after he replaced Keir Starmer in Downing Street on Monday was "warm."

"Obviously we will continue to build the relationship as we go forward," Burnham told the broadcaster in his first media interview since taking power.

"It's a changing world... and you just have to obviously call things as they develop."

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"I can't at any point say that I won't take a different opinion from him, that I will need to voice a different idea that is right for Britain. And I will do that."

Burnham (56), a veteran figure within center-left ruling Labour who was the mayor of Greater Manchester in northern England for nine years from 2017, twice declined to directly answer whether he trusts Trump.

The UK's new leader also insisted he would "of course" be willing to call the US president out if needed.

"You have to defend your own national interest before anything else," he said. "That's what you're required to do if you're to do this job properly. I will always put Britain's interest first."

Following Monday's phone call, Trump said in a post on his Truth Social platform that Burnham "has got a big job ahead of him, but he will be able to do it."

He pledged his country "will be there to help."

However, in remarks last month, Trump had branded Burnham "extremely liberal."

Trump had a sometimes fractious relationship with Starmer, which soured in particular over the US-Israeli war on Iran.