The prime minister kiboshed suggestions that 2019 elections for the House of Representatives and Senate could be broken up and held months apart.

"That's just Canberra bubble chatter. We've got no plans to do it," Mr Morrison told reporters in Queensland on Tuesday.

A general election is due by May and remains the most likely scenario.

However, some coalition MPs have been canvassing a radical proposal to buy their government more time to win back support.

The plan involves holding a Senate election early in 2019 and a separate election for the lower house later in the year, Fairfax Media reports.

Labor senator Jenny McAllister savaged the "desperate" idea, which would be expensive.

"It's a marker of how desperately obsessed this crowd is about their own jobs that they're coming up with crazy plans like this," she told Sky News.

"I think it would be extremely unpopular with voters. It hasn't happened for decades. I'm very surprised to see people talk about it."

Government minister Simon Birmingham is confident Australians will go to the polls in May.

"I would fully expect that a normal election will be held, in the normal course of events, in the normal time, which is May next year," Senator Birmingham told the ABC from Shanghai.

Mr Morrison is spending the week touring marginal LNP seats on Queensland, in what is widely considered a soft-launch of his federal election campaign.

Asked on Monday whether his four-day bus tour amounted to a quasi-campaign, Mr Morrison replied: "This is me doing what I do. I'm out, I'm listening, I'm hearing and I'm doing. That's what I'm doing as a prime minister."

Australian Associated Press