National's Covid-19 spokesperson Chris Bishop has hinted at throwing his hat in the ring for Party leader, revealing he's thinking about it.

Caucus will meet on Tuesday to decide Judith Collins' replacement after she lost a vote of no confidence yesterday.

Simon Bridges has declared he'll make a bid for the top spot and interim leader Shane Reti won't rule out making a move.

Christopher Luxon, Mark Mitchell and Nicola Willis are also on the table as possible contenders.

Bishop told Heather du Plessis-Allan his merits as a potential leader are for others to judge.

“You know, lead the charge on the biggest issue facing the country for the last year or so, and lead the charge on MIQ and some of the things like rapid antigen testing.”

Meanwhile, Bishop has dubbed the slow move to introduce Rapid Antigen testing as 'unfathomable'.

It comes after a report that finds New Zealand was ill-prepared for the Delta outbreak.

Advisor Sir Brian Roche warned the health system's infrastructure was fragile - and stressed the need for rapid antigen testing.

The tests will be made available for businesses to source from December 1, and can be bought from pharmacies from December 15.

Bishop told Heather du Plessis-Allan the Government has had a blind spot for innovation.

“They thought that elimination would work against Delta, they assumed it would work. It didn’t. And then when it didn't work, we didn't have a backup plan and now we’re scrambling, right?”

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