You are not permitted to download, save or email this image. Visit image gallery to purchase the image.
Speaking to Skykiwi, a Chinese-language news site, Key said he saw "similarities" between himself and Luxon.
"We both share very similar economic views, we're economically conservative but we're internationalists - we want to see New Zealand engage with the world and trade with the world and have a harmonious, multi-cultural society operating in New Zealand.
"...both of us know that unless you know there is a strong economy in the end people don't have the confidence and choices to look after themselves and their family."
Luxon, the former chief executive of Air New Zealand, is now running as National's candidate in the safe Botany electorate in this year's election.
Key even speculated as to what Luxon would be like as a prime minister.
"If Chris was the prime minister, I think what you would see is a very strong emphasis on the economy.
"Whoever the prime minister of the day is, ultimately we'll get through Covid-19, but the challenge it represents on the economic side is going to be very significant and with us for quite a long time."
The video was released online the same day as Bridges faced continued backlash over his controversial Facebook post on the Government's decision to extend the alert level 4 lockdown.
The National leader said small businesses across the country have been the "sacrificial lamb" for the Government, after the alert level 4 lockdown was extended until midnight on Monday.
He said the lockdown was extended because ministers didn't lay the necessary groundwork.
The post attracted more than 16,000 reactions – many of them negative - and the Opposition leader had been facing speculation from some in the media that his job might be on the line.
Finance Minister Grant Robertson later called out Bridges for "politicising" the level 4 lockdown extension, saying his comments on small businesses are insulting.
National deputy leader Paula Bennett denied reports on Wednesday she might be lining up with Mark Mitchell to take over the leadership.