Prime Minister Tony Abbott called the Australian Labor Party previous governments - headed by Kevin Rudd and Julia Gillard - "wacko" and "embarrassing" during a phone interview with Lally Weymouth from The Washington Post.

As how Mr Weymouth put it, Mr Abbott "did not mince words when it came to his opinion of the Labor government that preceded him."

The interview went as far back as Mr Abbot's victory speech where he said Australia is once again open for business, a statement which implied that the previous government was unfriendly to business.

"I said Australia is under new management and is once again open for business. The previous government would often say the right thing but it would invariably do the wrong thing when it came to business. There was an explosion in red tape and green tape. There was a whole thicket of new restrictions in the labor market. There were big new taxes. It was a government which thought that there was no problem that more public servants, higher taxes and further regulation couldn't fix."

Mr Abbott started his slew of words attack to the previous government when Mr Weymouth prodded him about the national broadband network.

Mr Weymouth clarified that Labor wanted to extend fiber to every household to which Mr Abbott said:

"Welcome to the wonderful, wacko world of the former government."

Mr Abbott went on saying that the Rudd government was "the most incompetent and untrustworthy government in modern Australian history."

"They made a whole lot of commitments, which they scandalously failed to honor. They did a lot of things that were scandalously wasteful and the actual conduct of government was a circus. They were untrustworthy in terms of the carbon tax. They were incompetent in terms of the national broadband network. They were a scandal when it came to their own internal disunity. They made a whole lot of grubby deals in order to try and perpetuate themselves in power.  It was an embarrassing spectacle, and I think Australians are relieved they are gone."

Meanwhile, political scientist Norman Ornstein, said that Mr Abbott's strong words against the Rudd and Gillard governments can affect his working relationship with the Obama Administration.

''It really does violate a basic principle of diplomacy to drag in your domestic politics when you go abroad. It certainly can't help in building a bond of any sort with President Obama to rip into a party, government and - at least implicitly - leader, with whom Obama has worked so closely. Perhaps you can chalk it up to a rookie mistake. But it is a pretty big one," Mr Ornstein told The Canberra Times.

He explained that politicians around the world avoid, as much as possible, scenarios where they speak of disdain against local political rivals when speaking to an overseas audience.

Mr Ornstein is a resident scholar at the American Enterprise Institute and one of the Foreign Policy magazine's 100 "top global thinkers" in 2012.