Allegations swirling around Justice Minister Judith Collins' involvement with milk company Oravida were kept on the boil when NZ First leader Winston Peters spoke to a meeting in Wanganui on Friday.
Claims have been made that the company, in which Ms Collins' husband is a director, got preferential treatment after the minister visited China last year.
Last week Mr Peters suggested a Chinese import clearance certificate for Oravida's fresh milk and posted on the company's website in late December was linked to Ms Collins' visit to China and dinner with a Chinese border control official a few weeks earlier.
Ms Collins has consistently maintained that Oravida's business was not discussed when she met the unnamed Chinese border control official at what she says was a "private" dinner.
A botulism scare last year stopped Kiwi dairy products at the Chinese border, but last week Mr Peters told his 150-strong Wanganui audience at the Central Baptist Church that he believed Oravida had received preferential treatment.