The parents of the British teenager who was killed in a crash allegedly involving an American diplomat's wife have refused to meet the woman after it was revealed to them she was at the White House during their meeting with Donald Trump.

Key points: A Dunn family spokesman said the US National Security Adviser told them Anne Sacoolas will not return to the UK to face the law there

A Dunn family spokesman said the US National Security Adviser told them Anne Sacoolas will not return to the UK to face the law there The Dunn family was shocked that the US President had apparently tried to organise a meeting with Ms Sacoolas without telling them

The Dunn family was shocked that the US President had apparently tried to organise a meeting with Ms Sacoolas without telling them 19-year-old Harry Dunn was killed when riding his motorbike and Ms Sacoolas, allegedly collided with him while driving on the wrong side of the road

Their son, 19-year-old Harry Dunn was killed in August when his motorcycle collided with a car allegedly driven by Anne Sacoolas, the US diplomat's wife, outside a British air force base in southern England used by the US military.

Ms Sacoolas left Britain shortly after, though police released a statement saying she had previously told them she had no plans to depart.

Dunn's parents, Charlotte Charles and Tim Dunn, met with the US President in Washington but were left shocked by the "bombshell" that Ms Sacoolas was at the residence and ready to meet with them.

They were taken aback by the move and refused to speak with her and then detailed their experience in the British media.

"The bombshell was dropped not soon after we walked in the room that Anne Sacoolas was in the building and was willing to meet with us," Ms Charles told Sky News UK.

"We made it very clear, as we have said all along that we will meet with her, and we are still willing to see her — but it has to be on our terms and on UK soil."

President Trump met with the Stanley Cup champions at the White House on the same day. ( Reuters: Johnathan Ernst )

The spokesman for the Dunn family had earlier tweeted that the meeting had occurred.

"Meeting with President Trump complete," Radd Seiger tweeted.

"We will review where we are up to and determine next steps shortly when we will comment further. In the meantime the search for #Justice4Harry continues."

The reason for his tweet was later revealed as he went into further details and gave his account of the events with Mr Trump to the BBC.

'Not coming back' to the UK

"To just have that [potential meeting] sprung on them … it wasn't mentioned when they called me, I thought we were coming down to have a debate on the diplomatic immunity laws," Mr Seiger told BBC Breakfast.

"It soon became clear to us the real reason for inviting us down was to get Charlotte and Mrs Sacoolas in a room together.

"I intervened and said 'look Mr President, this is a meeting that should take place but it's a few months down the line — and we will do it in the UK'.

"Robert O'Brien, the National Security Adviser, was in the room and he said quite emphatically 'she is not coming back'.

"I think the family feel a little ambushed to say the least."

Harry Dunn's family are campaigning to extradite the alleged US driver in the fatal car crash. ( Facebook )

Mr Dunn's parents have been pressing for Ms Sacoolas to return to Britain, and held a press conference in New York on Monday to press their case.

His mother tearfully urged her to "do the right thing" and to "face us as a broken family", along with the UK legal system.

"She needs to set an example to her own children that you can't run away," Ms Charles said.

Mr Trump last week called the collision "a terrible accident" and said he planned to intervene by potentially arranging a meeting between the Dunns and Sacoolas.

He added that accidentally driving on the wrong side of the road in England, where drivers drive on the left instead of the right side of the street, is something that "can happen," and that he had once done so himself.

A statement previously released on Ms Sacoolas's behalf said she intended to continue to cooperate with authorities.

ABC/AP