Jon Hassall, chairman of Lincolnshire Police Federation, asked the Home Secretary about the impact of spending cuts on resources and pensions.
He said: "Your Government uses phrases like 'we're all in this together'. That rings hollow now."
He added: "People I represent are now taking home less pay than they used to. Are you aware vast swathes of the police force don't trust you or your Government?"
Theresa May replied: "I recognise the difficulties that this has led to for some."
The Police Federation hopes the Government will to "listen to and acknowledge" issues affecting its members at this year's conference.
"We are reforming the police force to make sure it is equipped for the challenges of the future", says the Policing minister.