Correspondence obtained by The Sunday Times reveals the Obama administration considered compassionate release more palatable than locking up Abdel Baset al-Megrahi in a Libyan prison.
The intervention, which has angered US relatives of those who died in the attack, was made by Richard LeBaron, deputy head of the US embassy in London, a week before Megrahi was freed in August last year on grounds that he had terminal cancer.
The document, acquired by a well-placed US source, threatens to undermine US President Barack Obama's claim last week that all Americans were "surprised, disappointed and angry" to learn of Megrahi's release.