Whoever walks out of today's National party caucus as the leader, will have the full support of ACT.

After plummeting in the latest polls, National's holding an emergency caucus at midday.

The leadership of Simon Bridges is under threat.

Bay of Plenty MP Todd Muller is the only declared challenger, but there are suggestions others could raise their hand depending on how things play out.

ACT leader David Seymour told Mike Hosking he's backing National to help the country recover financially from Covid-19.

“Jacinda Ardern may be pleased to own the Covid-19 response now, but she won't be pleased to own the economic fallout and Labour’s mismanagement of the economy."

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