The NUJ has attacked Tony Blair for comments he reportedly made about the BBC over the weekend, saying his criticism of the corporation's coverage of Hurricane Katrina "exposed his contempt for public service broadcasting and the BBC in particular".
The NUJ general secretary, Jeremy Dear, said the suggestion that the BBC's coverage had been "full of hatred for America and gloating", revealed the prime minister's "craven devotion to President Bush ... only eclipsed by his craven devotion to Rupert Murdoch".
Mr Murdoch revealed Mr Blair's alleged comments at a seminar hosted by former American president Bill Clinton on Friday.
Mr Murdoch reportedly said: "Tony Blair - perhaps I shouldn't repeat this conversation - told me yesterday that he was in Delhi last week and he turned on the BBC World Service to see what was happening in New Orleans. And he said it was just full of hate for America and gloating about our troubles."
The NUJ said the comments showed that the prime minister was trying to curry favour with Mr Murdoch.
"Tony Blair's criticism of the BBC for exposing the divide between rich and poor in the US and the slowness of the emergency services to provide relief to the poor of New Orleans is beyond contempt, " Mr Dear said.
"Tony Blair has deregulated broadcasting to serve the interests of Rupert Murdoch. His latest attack on the BBC shows he is still doing Murdoch's bidding."
Both the BBC and Downing Street are trying to distance themselves from a possible fallout.
"We have received no complaint from Downing Street, so it would be remiss of us to comment on what has been reported as a private conversation," said a BBC spokewoman.