“Please do,” Mr Dunn responded as the interview came to an end.
Last week, Rabb defended the decision by the Foreign Office to “seek costs” from the family over the legal case against their investigation.
Speaking on Sky News, the Foreign Secretary said: “We just cannot responsibly allow ourselves to be sued without taking the normal action in defending ourselves when the position that the representative and the family are pursuing in law is wrong.
“It pains me because I want to give them the solace of justice in this case.
“But we also need to protect the taxpayers’ money and the legal position that we set out, which is the correct one.”
This Morning airs weekdays at 10.30am on ITV.