The parents of Harry Dunn have said they will only meet Anne Sacoolas, the woman suspected of causing their son’s death, if she returns to Britain.
A spokesman for Charlotte Charles and Tim Dunn said the condition was a “non-negotiable red line in the sand” if Mrs Sacoolas wished to meet the teenager’s parents while they are in the US.
“She must return to the UK and face the consequences and I'm awaiting a response to that,” Radd Seiger told Sky News on Monday.
"There's not much point in meeting and having pleasantries if that commitment isn't there."
Harry Dunn, 19, died when suspect Mrs Sacoolas’s car crashed into his motorbike outside RAF Croughton in Northamptonshire in August, allegedly after pulling out on the wrong side of the road.
Mrs Sacoolas, 42, has been said by the US to be covered by diplomatic immunity as the spouse of a US intelligence official, although that protection is now in dispute.
Harry’s grieving parents flew into New York on Sunday to, as spokesman Mr Seiger said, “put pressure on the US administration to do the right thing”.
Ms Charles said before boarding her flight that she had received a letter from Mrs Sacoolas expressing her “deepest sympathies and apologies”.
“To be perfectly honest, yes, it’s the start of some closure for our family,” she said.
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“Having said that, as it’s nearly seven weeks now since we lost our boy, sorry just doesn’t cut it.”
The family said they “continue to live in a nightmare” and have so far been unable to grieve after his death.
“As if losing Harry was not enough, they now find themselves having to expend enormous time and energy, which they can ill afford, generating sufficient publicity to garner public support to persuade the US government,” Mr Seiger said.
At the weekend, the UK Foreign Office (FCO) wrote to the family to say Mrs Sacoolas did not have diplomatic immunity.
Mr Seiger said Foreign Secretary Dominic Raab’s letter stated: “The US have now informed us that they too consider that immunity is no longer pertinent.”
The letter said: “We have pressed strongly for a waiver of immunity, so that justice can be done… Whilst the US government has steadfastly declined to give that waiver, that is not the end of the matter.
“We have looked at this very carefully… the UK Government’s position is that immunity, and therefore any question of waiver, is no longer relevant in Mrs Sacoolas’ case, because she has returned home.”
Mr Raab added that the matter was now “in the hands” of Northamptonshire Police and the CPS.
An Foreign Office spokesman told the PA news agency that the office “would not be commenting further on the content of the letter”.
Meanwhile, Mrs Sacoolas’s legal representative Amy Jeffress, from law firm Arnold and Porter, said: “Anne is devastated by this tragic accident.
“No loss compares to the death of a child and Anne extends her deepest sympathy to Harry Dunn’s family.”
On Friday, Prime Minister Boris Johnson said America was “absolutely ruthless” in its safeguarding of Mrs Sacoolas following the decision to grant her diplomatic immunity.
Mr Johnson said although US President Donald Trump was sympathetic towards Mr Dunn’s family’s views on the use of diplomatic immunity, the US was “very reluctant” to allow its citizens to be tried abroad.