Peter Mandelson has been urged to answer questions as part of a US Congress investigation into paedophile financier Jeffrey Epstein.
In a letter to Lord Mandelson, two Democratic members of the House Oversight Committee said it is "clear" the former British ambassador to the US "possessed extensive social and business ties" to Epstein.
They added Lord Mandelson holds "critical information" linked to their investigation to Epstein's operations and have requested he makes himself available for a transcribed interview.
Lord Mandelson has expressed regret for his continued association with Epstein and apologised "to the women and the girls who suffered". The BBC has contacted him for comment.
The committee cannot compel Lord Mandelson to appear before the committee and the request has come from Democrats Robert Garcia and Suhas Subramanyam.
