A law expert says there's no indication Stuart Nash's mistakes amount to political corruption.

Communications from Nash are going under the microscope, with Prime Minister Chris Hipkins ordering a formal review.

It follows the discovery that he discussed a confidential Cabinet decision with two former political donors in 2020.

Nash has been stripped off all Ministerial portfolios, but intends to stay on as Napier's MP.

Otago University's Marcelo Rodriguez-Ferrere told Mike Hosking the standard for corrupt use of official information under the Crimes Act is very high.

LISTEN ABOVE