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Lawyers for the US State Department have declined a meeting with the parents of Harry Dunn.

The British teenager's mother Charlotte Charles and father Tim Dunn had hoped to discuss their son's case with the State Department after advice from the British embassy in Washington, it is understood.

Declining a meeting, State Department lawyers said a "decision on this case has already been made".

Dunn family spokesman Radd Seiger said the refusal to meet the family came after his written request and that the latest development made him “ashamed to be American.”

Speaking to Sky News, Mr Seiger added: "Not only has the State Department turned down a perfectly lawful request for a meeting, they're not even abiding by the terms of the extradition treaty.

"They're cowards and they have their heads in the sand.”

Mr Dunn's family claimed that US secretary of state Mike Pompeo "made a political decision" to reject an extradition request for 42-year-old Anne Sacoolas.

The 19-year-old's parents have said Mr Pompeo made the decision prior to "the legal process outlined in the extradition treaty being completed".

Mr Dunn was killed when his motorbike collided with a car outside a US military base in Northamptonshire on August 27 last year.

Mrs Sacoolas, the wife of a US intelligence official based at RAF Croughton, claimed diplomatic immunity after the crash and was able to return to her home country, sparking an international controversy.

Addressing the request for a meeting with the State Department, Mr Seiger said: "The parents have now discovered that the US government could not even bring itself to follow the legal and judicial process that should have been followed prior to the rejection having been made.

"Secretary Pompeo interfered by making his political decision first without regard to the rule of law or due process.

"Harry's parents accordingly sought a meeting with the lawyers in the State Department so that the situation could be explained to them.

"Not denying that that the process had not been followed, the lawyers have simply stated that the decision has been made and they are not in a position to discuss it any further.

"We are now in a shocking position of having to come to terms with the fact that the world's leading nation is not only abusing the conventions governing diplomatic immunity but now also cannot even be bothered to follow the process agreed in the treaty between the US and UK.

"It is the worst case of arrogance and unilateralism that I can remember. Harry's parents and supporters will not accept anything less than Anne Sacoolas returning to the UK and I will be meeting with officials in the British embassy in Washington DC tomorrow morning to discuss next steps."