British Prime Minister Boris Johnson on Monday urged the wife of a US diplomat to return to the UK to face justice for allegedly fatally striking a 19-year-old motorcyclist.

“I hope that Anne Sacoolas will come back and will engage properly with the processes of law as they are carried out in the country,” Johnson told the BBC on Monday.

Johnson continued to say he would go directly to President Trump if the woman refused to comply with his request.

Sacoolas, 42, was driving on the wrong side of a Northamptonshire road in late August when she fatally struck motorcyclist Harry Dunn, 19, head-on, authorities allege.

Sacoolas, the wife of US diplomat Jonathan Sacoolas, initially cooperated with local authorities. But she later opted to invoke diplomatic immunity, then left the country altogether with her husband and their children — reportedly at the suggestion of lawyers and US Embassy officials.

“I do not think that it can be right to use the process of diplomatic immunity for this type of purpose,” said Johnson.

“That’s a point that we’ve raised today with the American ambassador here in the UK and I hope will be resolved very shortly.

He continued: “If we can’t resolve it, then of course I will be raising it myself personally with the White House.”

The US State Department said in a statement that officials would weigh Johnson’s request — but cautioned that Britain shouldn’t get its hopes up.

“Any questions regarding a waiver of the immunity with regard to our diplomats and their family members overseas in a case like this receive intense attention at senior levels and are considered carefully given the global impact such decisions carry,” the statement read in part. “Immunity is rarely waived.”

Dunn’s grieving mother also made an appeal on Monday.

“We’re all broken,” Charlotte Charles told Sky News. “We’re just utterly shocked and appalled that somebody is allowed to get on a plane and go home and avoid our justice system.”

Charles offered an emotional appeal to Sacoolas — whose 12-year-old son was reportedly in her car during the crash — to return to the UK, mother to mother.

“She’s got to be suffering as well. She’s a mom,” Charles said of Sacoolas, who has not responded to requests for comment.

“Without knowing who this person is properly, we can’t . . . start our grieving process.”