Sinn Féin has told "massive untruths" over policing in Northern Ireland, one of US President George Bush's top advisers claimed today.
Mr Mitchell Reiss hit out at the republican movement after it mounted a new attack on the PSNI during St Patrick's Day celebrations in America.
In a $25,000 advertisement taken out in the New York Times, Sinn Féin condemned the service as deeply flawed.
But Mr Reiss, President Bush's special envoy to the North, urged the party to end its boycott of the policing arrangements and issued a scathing verdict on the advert.
He told BBC Radio Ulster's Inside Politics: "At best it was enormously misleading, at worst it was untruthful.
"The bottom line is there's massive untruths there and they need to reconsider their position as soon as possible."
PA