28/06/2016 8:20 AM AEST | Updated 15/07/2016 12:56 PM AEST

Scott Morrison And Barnaby Joyce Will Vote For Marriage Equality If Australians Want It

But some believe the plebiscite plan may fail.

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The Coalition's conservative figures will put their personal views aside.

Treasurer Scott Morrison and Deputy Prime Minister Barnaby Joyce will both back same-sex marriage if the overall plebiscite vote is in favour, despite Peta Credlin speculating the Coalition's plebiscite plan may fail.

The senior Coalition members' remarks on Tuesday morning are significant not only because they are some of the most conservative figures in the party.

It was revealed on Saturday MPs could ignore the national poll and vote in favour of their individual electorate's vote, in a "secret push" among conservatives. This has kept the marriage equality debate front and centre in the final week of the election campaign.

On Tuesday morning Barnaby Joyce said on he would put his personal views aside if the national vote was in favour of marriage equality.

"I will follow the instructions of the Australian people," Joyce said on radio.

Following the #scomophobia saga embroiling the Treasurer last week, Scott Morrison told Fran Kelly on Radio National he would not vote with his individual electorate's view, but the national poll.

"If the plebiscite carries, then the legislation should pass," Morrison said on Tuesday.

"If the plebiscite does not carry, then I should expect that is the end of the matter."

But the Treasurer did not delve into the Coalition's 'Plan B' on the issue after Tony Abbott's former chief of staff Peta Credlin said the legislation enabling a plebiscite may fail to pass in Parliament.

"No one on the government side has been very comprehensive and straight about the plebiscite," Credlin said on Sky News on Monday night.

"It is very likely it [the legislation] will be opposed by the Greens and Labor and Labor has got stronger in this campaign, not weaker. The government might claim a mandate but if Labor block it and the Greens block it in the upper house, what is plan B?

"All you hear from Government Ministers is 'we'll cross that bridge when we come to it'."

And with four days to go until election day, it's only getting closer.