Harry Dunn’s mother has called on Britain to face up to the "bullying" US government in the diplomatic row over the extradition of her son’s alleged killer.
Charlotte Charles said the UK faces the "road to ruin" if it concedes defeat in the fight to bring Ann Sacoolas, the wife of a US diplomat, to justice.
It comes after it emerged that Britain has agreed to extradite two fugitives to the US, despite their refusal to allow Sacoolas to face trial in the UK.
Sacoolas was charged with causing the 19-year-old's death by dangerous driving in December after he was killed outside a US military base in Northamptonshire on August 27.
Police in Britain have issued an international wanted notice for Sacoolas, 42, and an extradition request submitted by the Home Office for her was rejected by US secretary of state Mike Pompeo in January.
But Ms Charles said she hopes the UK government will keep fighting on her behalf, despite Mr Pompeo saying the January ruling was “final”.
"We don't want any problems with the US Government. But we can see that the US Government is behaving like a bully,” she said.
Read more: UK-US row flares over Harry Dunn case
"It will be a road to ruin if we back down as a country now and we have to stand up to them.
"I agree with calls that no-one should be extradited until the US Government agrees to play by the rules, starting with sending Anne Sacoolas back.
"She did not have diplomatic immunity."
The row over Sacoolas flared up once again this week after it emerged Home Secretary Priti Patel approved the extradition of Jabir Motiwala, 53, and Colin Wilkinson, 54, to the US from Hull last month.
Acting on behalf of Mr Dunn's parents, spokesman Radd Seiger added: "Arrangements for sending wanted people across the Atlantic are hopelessly weighted in favour of the Americans.
"As we have seen in the case of Anne Sacoolas, the American Government didn't even bother to go through the motions of putting the case through the legal and court system.
"Pompeo just said no, it's not happening and that his decision is final.
"In my numerous visits to Washington and speaking to leaders there, I sought to impress upon them just how stupid, reckless and short-sighted that stance would be.
"No-one would be going in the opposite direction and I have made it clear to leaders in Westminster that no-one is to go the other way until Anne Sacoolas is back."