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."