The family said CCTV evidence in the moments leading up to the crash made it “a clear-cut case”.

A tearful Ms Charles told reporters: “We just want to know that she is being brought back to the UK.

“You know, that would be a huge step in the right direction. It’s the only right thing to do. It’s the only humane thing to do.”

She added: “All of our grief has gone on hold, it’s coming out in other horrific ways, your legs feel like lead, you’re in pain morning until night that no painkillers can take away.

“You’re not able to cry, because we can’t understand this whole situation as to why she [Ms Sacoolas] would have left us without wanting to meet us back then.

“She needs to get on the plane and get back to the UK, just do the right thing.

“It shouldn’t be that difficult, it shouldn’t have been this difficult, she surely didn’t have to go.”

Ms Sacoolas has offered to meet with the parents, but Mr Dunn and Ms Charles have indicated a precondition for such an encounter would be Ms Sacoolas’s return to the UK.

During their press conference on Monday, the parents said that they would have worked to lessen any possible charges for Ms Sacoolas if she had come forward after the crash.

The family reiterated their hope to secure Ms Sacoolas a suspended sentence, rather than immediate custody, so as not to take her away from her family.

But, weeks after the crash, Ms Charles suggested that their interest in helping the woman who killed her son may be running out.

“She needs to do the right thing and come back and face what she’s done, face us as a family, face our UK system,” Ms Charles said.

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She continued, acknowledging a statement from Ms Sacoolas: “We heard it in a statement – I have not heard her voice... It’s seven weeks now, it feels too little too late.”

The parents said their hopes of a meeting between the two parties should happen “in her own words, in a room, on our terms” back in the UK.

Mr Trump has acknowledged the situation, but has not indicated that he would seek to compel Ms Saccoolas to return to the UK.

“The woman was driving on the wrong side of the road. That can happen,” he said last week. “Those are the opposite side of the road. I won’t say it ever happened to me, but it did.”