Dominic Raab warned today that there are "no measures" that Britain could realistically take to force the United States to extradite the alleged murderer of motorcyclist Harry Dunn.
The Foreign Minister said that while the 19-year-old had been "denied justice", the UK was unable to force Anne Sacoolas to comply with the authorities.
His comments came just hours after Dunn's mother Charlotte Charles asked the Prime Minister to make her son "top priority" during the US Secretary of State's visit to Britain next week.
Speaking to Sky News' Sophy Ridge on Sunday, Mr. Raab said: “It's heartbreaking, I understand how painful it was, I understand how exhausted they are. There is a denial of justice here.
Foreign Minister Dominic Raab warned that although there was a "denial of justice" Britain could not force Anne Sacoolas to abide by the authorities
In an emotional plea, Charlotte Charles asked the Prime Minister to make her son "top priority".
19-year-old Harry Dunn was killed when his motorcycle crashed into a car outside a U.S. military base in Northamptonshire on August 27 last year
"There is a request for extradition that is still pending. We asked Anne Sacoolas to return and our American partners to make it possible.
"But there are no measures that we can take credibly and realistically, which will somehow force the United States or Anne Sacoolas to do so.
"I want to be realistic because I don't want to raise expectations that will be dashed."
He added: "I raised it, we raised it in Washington, the Prime Minister raised it with President Trump and we will continue to make it clear that we are on the family side here, we think they should return, she has to go home for justice to happen. & # 39;
Mr. Dunn's mother had called Boris Johnson just a few hours earlier. Secretary of State Dominic Raab and Mike Pompeo discuss their son's case at a U.S. military base in Northamptonshire almost a year after his death.
In an emotional one In a video statement, Ms. Charles said, "Mr. Raab, Mr. Pompeo, Mr. Johnson, if you meet all of your families next week while mine is in ruins and my family has been torn apart, can you please, please discuss Harry?
"We have been assured that it is at the top of your priority list to discuss among all the other important global issues that surround you, but please, please make it a top priority."
The heartbroken mother continued: "It's been almost a year, please don't let that roll into a second year. We have his anniversary ahead of us, which will be more than painful for us.
"We don't want to repeat the last 11 months. It was terrible. You wouldn't wish your worst enemy.
"I don't want to experience any of this again and I definitely don't want to go into a second year where I have to face some of the things I've experienced in the last 11 months since Harry's loss.
“It's just about doing the right thing. It has always been like this, it will always be like this. Don't worry if you set a precedent to send back someone who is said to have this diplomatic immunity.
“We always agreed that immunity must be present in certain circumstances. This is not one of them.
“Please send them back. Bring Anne Sacoolas back to the UK and face the judicial system. She can go home, then do whatever has been returned to her. I don't care about this part.
Harry Dunn's mother asked the Prime Minister to discuss her son's case during Mike Pompeo's visit to Britain next week
Anne Sacoolas, 43, the wife of a U.S. RAF Croughton intelligence officer, was able to return to her home country after Mr. Dunn's death
Charlotte Charles and Tim Dunn have continued to urge the government to bring Ms. Sacoolas back to the UK
"My concern is to ensure that justice is brought and that Harry's life is actually thought and considered."
When Ms. Charles spoke today about Sky's Sophy Ridge, she described the last 11 months as "unbearable" and said she was "very determined to achieve this justice".
Timeline of events after Harry Dunn's death
August 27, 2019: 19-year-old Harry Dunn was killed on his motorcycle near Croughton, Northamptonshire, near the RAF Croughton exit when it collided with a car driving in the opposite direction
August 28, 2019: The suspect Anne Sacoolas is interviewed by the police. The Northamptonshire police are requesting a diplomatic waiver of immunity
September 16, 2019: The Federal Foreign Office informs the police that the waiver was refused and that Sacoolas had left the UK on a US Air Force plane
October 15, 2019: Charlotte Charles and Tim Dunn bring their campaign for justice to the United States, where they meet with President Trump in the White House. They refuse to meet the suspect who was waiting in a room next door
October 31, 2019: The Northamptonshire police interview Sacoolas in the United States after asking for permission
November 25, 2019: Dunn's parents submit a judicial review of the Secretary of State's efforts to extend diplomatic immunity to RAF Croughton intelligence officers and families
December 20, 2019: The Crown prosecutor announces that Sacoolas has been accused of causing death from dangerous driving and that extradition proceedings have been instituted against her
10. January: The Home Office has officially requested extradition of Sacoolas to bring charges in the United Kingdom
January 23: Secretary of State Mike Pompeo formally rejects extradition requests
April 28: Charlotte and Tim write a letter to the U.S. government asking them to change their minds about the diplomatic immunity granted to Sacoolas
May 11: A red notice from Interpol is being issued for the arrest of Sacoolas
She said, "I don't even know where we would start. Tormenting more than every day. We have to wake up every morning and know that Harry is not with us and we have to try to live with it.
"You dream of him at night and wake up and feel angry and bitter that we have remained in ruins and in ruins without a family and still have no justice for him. Was tired. Still very determined to achieve this justice.
& # 39; The determination is still extremely strong, but we are tired and we need Britain to work really hard with the US government now and to end this.
"Bring them back and get this justice and don't allow us and force us to go into a second year of struggle."
The Dunn family spokesman, Radd Seiger, added: “What we want now, and I have asked Mr Raab this several times, is a very clear, structured plan to bring Anne Sacoolas back.
& # 39; It is no longer good … that they are increasing it continuously. That means nothing for the family.
& # 39; She has to come back. Actions have consequences. This is one of the most outrageous human rights violations America has ever committed against a British citizen, a British family. Where's the special relationship?
& # 39; We need a clear concrete plan. If the United States doesn't send them back, what will Britain do with specificity to ensure that this terrible injustice is remedied?
"This is the UK's opportunity to show Mr Raab the nation that he will do his first duty to protect and protect the lives of British citizens." He must now assert himself against the United States. & # 39;
19-year-old Harry Dunn was killed when his motorcycle crashed into a car outside a U.S. military base in Northamptonshire on August 27 last year.
Anne Sacoolas, 43, the wife of a U.S. RAF Croughton intelligence officer, claimed diplomatic immunity after the crash and was able to return to her home country.
She was accused of causing death in December from dangerous driving, but a Home Office-led extradition request was rejected by US Secretary of State Mike Pompeo in January – a move the State Department has since described as "final".
A request for extradition submitted by the Home Office for her was rejected by Mr. Pompeo in January – a decision that the State Department described as "final".
Mr. Dunn's parents last month lost a fight to the Supreme Court to force the State Department to reveal documents related to the 1995 US-UK "secret immunity" agreement that allowed Ms. Sacoolas to enter the country after the teenager's death to leave.
After a preliminary hearing held by video call from a distance, Lord Justice Flaux and Mr. Justice Saini rejected the Federal Foreign Office's request for further evidence before a full hearing.
Lord Justice Flaux said: "We do not believe that any of the documents we are looking for is necessary to determine the facts fairly and fairly, so the application will be rejected."