Tasmanian Treasurer Peter Gutwein has denied reports he was called a "f***ing mendicant" by then-federal treasurer Scott Morrison during GST negotiations earlier this year.

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The Prime Minister was also asked to comment on the News Corp reports, which said he was sidelined from GST negotiations with Tasmania after he abused Mr Gutwein in "an expletive-laden tirade".

"No, that's rubbish," Mr Morrison said.

In a statement, Mr Gutwein said it was not his usual practice to comment on private conversations.

"I can confirm that during our discussions relating to the GST, the phrase attributed in today's media to Mr Morrison was not used," he said.

"Mr Morrison and I continue to have a very good working relationship and most importantly, the GST proposal that Mr Morrison and I reached is, on face value, a good deal for Tasmania."

When the proposed new GST model was revealed in July, both Premier Will Hodgman and Mr Gutwein said they would go over it with a "fine-tooth comb", but Mr Morrison said at the time the states had no power to reject the proposal.

Tasmania's Health Minister Michael Ferguson said he had not been part of "the phone call" about GST.

"We're all grown ups here and Tasmanians should expect that their government have robust discussions where it's required," Mr Ferguson said.

Federal Shadow Treasurer Chris Bowen said it was clear what Mr Morrison thought of the people of Tasmania.

Peter Gutwein (L) said he and Mr Morrison "continue to have a very good working relationship". ( ABC News: James Dunlevie )

"Was the phone slammed down in the ear of the Tasmanian Treasurer? Clearly, this conversation occurred and Scott Morrison told the Treasurer of Tasmania what he thinks of him."

Mr Bowen said the phrase "we don't comment on private conversations" is "what you say when you can't deny it".

"I will stand by my comments on all sorts of matters, but clearly, when the Tasmanian Government says 'we don't comment on private conversations', that is as close as you get."

In Federal Parliament, Mr Morrison talked up his commitment to Tasmania, listing billions of dollars of spending in the state.

"That's what I call recognising Tasmania," he said.

"Running a strong economy, working with Premier Hodgman and Treasurer Gutwein in Tasmania."

Labor member for Franklin Julie Collins told Parliament that Tasmanians deserved an apology from Mr Morrison for his "outrageous slur".

In Hobart, the state opposition's Scott Bacon said it was clear that Mr Morrison has a deep contempt for Tasmania.

"The relationship particularly between Peter Gutwein and the new Prime Minsiter is very much under pressure," Mr Bacon said.