British Prime Minister Boris Johnson | Peter Summers/Getty Images Boris Johnson will speak to Trump if US refuses to waive immunity for diplomat’s wife The prime minister’s spokesperson tells journalists the British foreign secretary has spoken to the US ambassador.

LONDON — Boris Johnson has urged the U.S. to reconsider giving immunity to the wife of a diplomat who is a suspect in a fatal road crash in the U.K. — and will raise the issue with Donald Trump if that doesn't happen.

Teenager Harry Dunn died when his motorbike collided with a car near an RAF base in Northamptonshire on August 27, the prime minister's spokesperson said on Monday.

A U.S. diplomat's wife, named as Anne Sacoolas, left the U.K. despite telling police she had no plans to, the BBC reported.

Johnson told ITV News: "I do not think that it can be right to use the process of diplomatic immunity for this type of purpose. And I hope that Anne Sacoolas will come back and will engage properly with the processes of law as they are carried out in this country."

"That’s a point that we’ve raised or are raising today with the American ambassador here in the U.K. and I hope it will be resolved very shortly. And to anticipate a question you might want to raise, if we can’t resolve it then of course I will be raising it myself personally with the White House."

Boris Johnson says he will speak to the White House "personally" to urge the US to waive the immunity of a diplomat's wife who is suspected of being involved in a crash that left 19-year-old Harry Dunn dead. Read more: https://t.co/tqGLSMtdB5 pic.twitter.com/bLAw7tcizc — ITV News (@itvnews) October 7, 2019

Foreign Secretary Dominic Raab has spoken to U.S. Ambassador Woody Johnson and is due to meet the Dunn family, with details currently being finalized.