Election 2020: National leader Simon Bridges tight-lipped on whether he'd work with Winston Peters

The National Party is keeping tight-lipped on whether or not it will consider working with New Zealand First. 

On Tuesday, the Government announced the general election will take place on September 19 - in a vote like no other with two referendum topics on polarising issues.

But while voting on those topics - cannabis and euthanasia - voters will have to decide which leader and party they wish to govern.

Likely to have a big impact on who that person and party is will again be New Zealand First - which opted for a Labour coalition at the last election.

So would National consider a coalition with NZ First - which it hasn't worked with for 22 years? Despite a tumultuous relationship with party leader Winston Peters, National leader Simon Bridges isn't ruling it out yet.

"I'm not going to make an announcement today," he told The AM Show on Wednesday, adding "it will be soon".

"Let's just wait and see."

Speaking about the current coalition Government, Bridges said he's not expecting much to come out of an announcement by the Government on its infrastructure plans.

Bridges told The AM Show that Labour has failed to deliver on any of its promises.

"Their policies are all over the show," he said.

The Government will on Wednesday reveal its $12 billion infrastructure package, which is likely to go to a number of roading projects.

"Just to give everyone a scale of that investment, that is roughly three times the amount of new capital spending that you'd see in a Budget - in one go, outside of a Budget cycle," Prime Minister Jacinda Ardern said on Thursday. "It is huge."

But Bridges claims half of that spend is just "business as usual".

"When you get down to actual roads that get people around - they've cancelled more than they could ever deliver," he told The AM Show.

Ardern last week said the time was right for the infrastructure spend.

"We have infrastructure needs in New Zealand and we also have low debt and we're also at a point where borrowing is incredibly cheap."