Helen Clark reckons political polling's behind disagreements in the coalition.

Winston Peters' office released emails showing Prime Minister Chris Luxon was advised against supporting the US and Israel's strikes on Iran.

National's Nicola Willis believes Peters is playing politics - and should have informed them before releasing the emails.

Willis separately accused NZ First of race-baiting in their opposition to the India free trade deal.

Clark says Willis is not holding back.

"New Zealand First is eating fairly deeply into National's support, and that is starting, I think, to become somewhat more corrosive in the coalition." 

LISTEN ABOVE

• Nicola Willis lashes out at ‘confused’ Winston Peters, suggests coalition breach after Iran war emails released
• 'They're eating each other': Helen Clark unsure if coalition Govt will survive to election
• New Zealand First pulls ahead of Act and National in major donations
• Peters says NZ First 'won't do deal with Labour', but Willis unconvinced
• PM speaks on Middle East war, Trump 'rhetoric', and India FTA after tumultuous week