The parents of motorcyclist Harry Dunn, who died in a crash near RAF Croughton, say they will only meet the US woman allegedly involved if she promises to return to Britain.
Anne Sacoolas, who is allegedly married to a US intelligence official, left the UK under diplomatic immunity while police were investigating.
She has offered to meet Mr Dunn’s parents who are currently in the US, where they hope to gain media exposure that will “put pressure on President Trump to send Mrs Sacoolas back”.
Radd Seiger, a spokesperson for the Dunn family, said: “Mrs Sacoolas has to commit to returning to the United Kingdom to submit herself to the English authorities, to Northamptonshire Police, and to co-operate with their inquiries.
“Her return was a non-negotiable red line”.
Mrs Sacoolas, 42, was said to be covered by diplomatic immunity as the spouse of a US intelligence official, though that protection is now in dispute.