Tony Abbott has issued yet another warning to the Federal Government, declaring that voters expect Opposition Leader Bill Shorten will soon become the Prime Minister.

Key points: Voters "sick of politicians who change to suit their political convenience", Tony Abbott says in an opinion piece

Voters "sick of politicians who change to suit their political convenience", Tony Abbott says in an opinion piece Mr Abbott says solution is not to roll PM Malcolm Turnbull, says Coalition should adopt more conservative principles

Mr Abbott says solution is not to roll PM Malcolm Turnbull, says Coalition should adopt more conservative principles Mr Abbott is calling for the Government to reverse renewable energy subsidies and scrap Human Rights Commission

Writing an opinion piece in News Corp newspapers, the former prime minister said Australians were "sick of politicians who change their policies to suit their political convenience".

But he said the best solution was not to roll Prime Minister Malcolm Turnbull, advising his party to instead embrace more conservative principles and show greater political conviction.

Mr Abbott's most recent intervention comes after he said in February there was a risk the Coalition would "drift to defeat if we don't lift our game".

Cabinet Minister Darren Chester said the Coalition already had a plan to prevent Labor from winning the next election.

"The best way to keep Bill Shorten out of the Lodge is to be a good government," Mr Chester told AM.

Trade Minister Steve Ciobo said it was "stating the obvious" to say politicians were unpopular with the Australian public.

"I don't get overly concerned about the interventions of former prime ministers or backbenchers or others," he said.

"There is … an appropriate level of cynicism sometimes about what governments are doing, of either persuasion."

'Don't sack an elected PM yet again': Abbott

Mr Abbott was among MPs taking part in the recent Pollie Pedal charity bike ride.

The former PM described the ride as a "listening tour", saying voters told him there was an expectation Mr Shorten "could soon be in the Lodge", the Prime Minister's official residence in Canberra.

"As a Liberal, I think we've got to do something about Bill Shorten because if we don't do something about Bill Shorten there could very well be a change of government at the next election," Mr Abbott told Sydney radio station 2GB.

But he did not endorse rolling Mr Turnbull, advising the "best way to keep Shorten out is not to sack an elected prime minister yet again but to ensure that the government does its job better".

"We are a great country and a great people, we just need a government that is as good as we are," Mr Abbott said.

He again called for the Federal Government to reverse renewable energy subsidies and scrap the Human Rights Commission.

Mr Abbott also wants the power of the Senate reduced, saying people realise it has "become a real obstacle to good government."

Mr Chester said the Coalition was focused on trying to "fulfil every promise we made during the last election campaign".

"We've got to work together as Liberal and National Party MPs and ministers who are passionate about Australia's future and deliver everything we said we'd do — that's what people expect of their governments."

'Man-to-man' chat with Cormann

Mr Abbott said he had a "robust", "man-to-man" conversation with Finance Minister Mathias Cormann, who said in February that Mr Abbott's interjections were "deliberately destructive".

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Listen Duration: 5 minutes 3 seconds 5 m PM and Ministers unload on former leader Tony Abbott Download 9.3 MB

"We had a very blunt conversation about that — if you don't like what someone is doing, rather than speak out publicly you should have a man-to-man discussion," Mr Abbott told 2GB.

"As a former prime minister, people would expect me to have something to say from time to time on important national and international issues, and I certainly intend to continue."

When Mr Abbott was ousted as Prime Minister in September 2015, he promised there would be "no wrecking, no undermining, and no sniping".