The leader of Northamptonshire County Council, Heather Smith, has criticised the county's MPs for failing to support it through a time of financial hardship.
The county council needs to find £37m of savings in next year's budget - with services such as libraries already in the firing line.
That prompted Michael Ellis, the MP for Northampton North MP and a fellow Conservative, to declare he has lost confidence in the authority.
The BBC has now seen a leaked letter from Councillor Smith addressing that criticism.
In it she accuses Northamptonshire's seven MPs, who are all Conservatives, of a lack of support for what she calls one of the most under-funded counties in the country.
She also says the blue-on-blue attack could play directly into the hands of political opponents, warning political infighting could make stories about the savings explode even further.