Former National Party leader Simon Bridges, who is again contesting the leadership, is feeling "really good" heading into today's caucus decision.

National MPs are arriving at Parliament today, ahead of the leadership vote in a caucus meeting starting at 3pm.

The party's leadership was catapulted in chaos after then-leader Judith Collins summarily demoted Simon Bridges last week

Shellshocked, MPs went into a hastily called caucus the next morning and cast a vote of no confidence in her. Deputy Shane Reti became interim leader and today was set down for the vote.

Today's contest appears to be a showdown between Bridges and political novice Chris Luxon, who seems to have an edge in support from the caucus.

Bridges, arriving at Wellington Airport this morning, had a positive attitude despite the ructions of last week and most pundits giving Luxon the edge.

"Really good, I think it's gonna be a good day, a good day for the National Party," he said.

"That's because I think we'll draw a line under the past, be able to really take a government focus on what matters to New Zealanders and the solutions that are required and I think win the next election.

"So I feel really good about today."

Rotorua MP Todd McClay was also positive about the day, despite the gloomy, drizzly weather in the capital.

"I think it's a great day to select a new leader for the National Party ... the one thing we've heard from our members is they want us to be united as a caucus. Really good conversations over the weekend and I think we're going to come out with a great result today.

"Not worried about anything, the National Party will make the right decision today, the caucus is really focused. We know the important job is to focus on what the government's doing."

He said his message to the incoming leader would be that "the caucus will be behind that person".

Finance spokesperson Michael Woodhouse was not revealing who he might support.

"We don't talk about what goes on in the caucus room ... we'll just see what the options are ... that'll be for the collective wisdom of the caucus to decide," he said.

He said he was sure it would be a good day and "follow the usual script".

"It is important that we get back to focusing on the things that matter to New Zealanders so we'll get through this today and I look forward to doing just that."

Taranaki-King Country MP Barbara Kuriger said caucus unity behind one leader was crucial, and the party was "absolutely" capable of doing that.

"It's critical. We've had a terrible year and a half and this is our opportunity to get it right.

"We've got an election to win in 2023 and I'm confident that we can do that ... with anyone that we choose today it will be achievable. We will be on track for 2023."

She was keen for the party to put the past week behind it.

"I'm worried about what happened last week. That wasn't where we needed to be and I'm sure this afternoon that we'll come out with a decision that works us into a good place whoever wins.

"I hope everybody uses this as an opportunity to pick up their game - everyone - and that's where I sit, because you know there's so much we need to deal with right now that the government's doing that we can't afford any more games, and I'm not tolerant of games."

She kept quiet about who she would support, but said it would be a "genuine contest".

Waikato MP Tim van de Molen was complimentary of both the main candidates for leader.

"We have a fantastic array of talent in National as you well know, they're both top-quality gents doing a fantastic job and I'm looking forward to having a resolution to this later today.

"Of course we've got to have one person leading the party. There's an important job for us to do and at the moment there have been some concerns around how the government's performing. We need to be in a better place to capitalise on that for the benefit of all New Zealanders.

"Everyone in our team brings a lot to the table and I'm looking forward to working with them all."