The war of words between the former deputy head of the UN mission to Afghanistan and the country's president escalated last night when Peter Galbraith suggested that Hamid Karzai's "mental stability" was in question and that he has a substance abuse problem.

Galbraith, the US diplomat who worked for the UN in Kabul until last year, made his remarks live on US television. His comments come as the White House considers withdrawing an invitation for Karzai to meet Barack Obama in Washington next month.

guardian.co.uk