Harry, 19, was killed in August 2019 after former US spy, Anne Sacoolas, crashed into his motorbike outside RAF Croughton in Northamptonshire, which houses a US spy base.
She was driving on the wrong side of the road at the time.
Sacoolas, who is married to a serving US spy formerly based at RAF Croughton, subsequently fled Britain with the help of the UK’s Foreign and Commonwealth Office (FCO).
The former CIA officer was charged with causing death by dangerous driving last December by the Crown Prosecution Service, the UK’s prosecuting authority. The crime of causing death by dangerous driving can attract a custodial sentence of up to 14 years.
In a video message on Sunday, Harry’s grieving mother, Charlotte Charles, made an emotional appeal to Democratic party presidential candidate Biden, who lost his eldest son to cancer in 2015, pleading that her family needs justice in order to “help us on the path” to recovery.
Ms Charles urged Biden to “do your best to amend” the situation, complaining that Sacoolas is “walking free” and “tearing us apart as a family”.
“I please urge you, should you win on November 3 to please reconsider the position the US has taken against us – and when I say us I don’t just mean myself and the rest of the parents, I mean us as the UK as well”, Harry’s mum pleaded to Biden.
Ms Charles’ emotional outreach to Biden is being widely seen as a reflection of the Dunn family’s exasperation with both the US and UK government’s intransigence over the issue.
It is worth noting that US Secretary of State, Mike Pompeo, has repeatedly rejected a half-hearted extradition request from the UK, describing the decision as "final".