Commentator backing Muller to win National Party challenge

The National Party is due to decide its leadership at midday today, after it was revealed Todd Muller was planning to challenge Simon Bridges for the role.

Bridges revealed he knew about the challenge on Wednesday and National MPs will hold an extraordinary meeting today for the vote.

Political commentator Matthew Hooton is supporting Muller to win - Kim Hill asked him how close does he expect the vote to be.