Mr Deripaska has never been convicted of any crime and denies all wrongdoing including any ties to organised crime. He insists his US ban is purely a bureaucratic error. Liberal Democrat MP Norman Baker, who has tabled questions in the Commons asking if the British authorities were aware of US concerns when issuing Mr Deripaska a visa, said today: "There are now a series of questions that need answering over Lord Mandelson's relationship with Mr Deripaska." it emerged today that Lord Mandelson and Mr Deripaska have known each other since at least 2004 - two years earlier than previously thought - when the two men were spotted dining in Moscow. Lord Mandelson had just been appointed a European Commissioner but had yet to take up the post. Lord Mandelson, appointed Business Secretary this month, has always insisted there was no conflict of interest in his friendship with Mr Deripaska. As European trade commissioner, he made decisions that may have had a direct impact on Mr Deripaska's business dealings, mainly in aluminium in which he made his fortune.