Anne Sacoolas was driving on the wrong side of the road in the United Kingdom last August before she collided with 19-year-old Harry Dunn, who was on his motorcycle. The accident took Dunn's life and while Sacoolas initially cooperated with local police, she fled to the United States weeks later. Her lawyers claimed diplomatic immunity because her husband is an American agent working within the UK.

Now, Dunn's family—after attempts to settle the matter through diplomatic channels—said it intends to sue both Sacoolas and President Donald Trump's administration for "lawless misconduct" and "attempting to cover it up."