The parents of a teenage motorcyclist killed in a car crash have claimed Boris Johnson has “no wish or intention” to meet them, as they continue their fight to get an American citizen to face trial in the UK.

They said that despite “repeated assurances to the contrary”, the prime minister has not spoken with them in person after Harry Dunn died in a collision last August and the suspect fled to the US.

“For all his multiple faults, even US president Donald Trump took the time and trouble to meet with Harry’s parents and extend his condolences personally,” said the family’s lawyer.

Radd Seiger, who is representing Charlotte Charles and Tim Dunn, said: “Mr Trump looked the parents in the eye and told them how sorry he was.

“Mr Johnson, on the other hand, has done his level best to steer clear of Harry’s parents and continues to do so.”

Mr Dunn was killed in a crash outside RAF Croughton in Northamptonshire last year.

Anne Sacoolas, the wife of a US intelligence official, claimed diplomatic immunity after the collision and returned to her home country, sparking an international controversy.

The victim’s parents have been campaigning for the suspect to return and face trial, however, the US said the UK’s extradition request is “highly inappropriate” and would be an abuse.

They have met with the British foreign and home secretaries, but their lawyer claimed promises to speak with the prime minister face-to-face have not been followed through.

“I have made numerous attempts to arrange the meeting and said we will meet anytime, anywhere,” Mr Seiger said. “Each offer has either been rebuffed or ignored.”

He claimed the parents were “deeply suspicious at the outset that he would be more concerned about his relationship with Mr Trump than Harry and them”, which “now appears to be the case”.

Mr Johnson has urged the US president to extradite Ms Sacoolas, and a formal request was put in last week.

However, the prime minister has since said that the chances of the suspect returning to the UK are “very low”.

Ms Sacoolas is accused of driving on the wrong side of the road when she collided with Mr Dunn’s motorcycle last August.

She claimed diplomatic immunity, but has now been charged with causing death by dangerous driving.

Asked whether Mr Johnson would meet the family, a Downing Street spokesman said: “The legal process is ongoing and the UK has submitted the extradition request.

“The prime minister will continue to work to get justice for Harry.”

Additional reporting by Press Association