National leader Bill English says he can't say whether one of his MPs was removed from a parliamentary committee because of a background including 15 years working with Chinese military intelligence.

Jian Yang re-entered Parliament at last month's general election, having first been elected in the 2011 election, after securing a placing of 33 on the recent National Party list.

The Financial Times and Newsroom reported on Yang's past last month, and that the Security Intelligence Service had taken an interest in his background, and interviewed people familiar with his activities as recently as last year.

In March of that year, Yang was removed from the foreign affairs, defence and trade parliamentary select committee where he had served since October 2014.

Advertisement

Today, English was pressed on Radio NZ on whether Yang's removal from the committee was connected to his past.

"I can't because I don't know for sure," English said.

Asked if he had any recollection about whether Yang's removal from the committee was linked with his background in China, English again said he couldn't comment.

"I know about Dr Jian, and I know there has been a lot of discussion about him in the media.

"What I am saying is I can't comment on that because I can't say for sure."

Asked if he had full confidence in Yang, English said his party had no reason to believe the way Yang had conducted his role as an MP was questionable.

"Issues around that have not been raised. This is all about what happened in China...no one has raised questions in an obvious way about his behaviour in New Zealand, as a New Zealand citizen."

Asked again, English said he had full confidence in Yang as an MP.

Advertisement

Newly unredacted documents from Jian Yang's 2004 citizenship application show Yang, who moved to New Zealand in 1999, did not list the 15 years he spent studying and working at the People's Liberation Air Force Engineering Academy and the Luoyang Foreign Languages Institute from 1978.

Both institutions are part of China's military intelligence apparatus.

In his citizenship disclosures, Yang lists only his work and study history at the Australian National University and the University of Auckland.

In a press conference after news of his background broke, Yang said he had served as a civilian officer in the PLA and was required to not name the institutions as a condition of being allowed to leave China.

He said he was not a spy, but conceded he was involved in training spies to assess intercepted communications.

Yang said he instead referred on applications to "partnership" civilian universities which had a relationship with the military institutions.

Advertisement

"It is not that I am deliberately trying to cover-up. It's because the system asked me to use the partner university," he said.

This month Yang told the Herald: "I have nothing further to add to the media comments I've already made. I refute any allegations about my loyalty to New Zealand."