Mr MacAskill was justice secretary when Megrahi was released on compassionate grounds in 2009.
Megrahi died in Libya in May 2012.
He was the only man convicted of the bombing of Pan Am Flight 103 over Lockerbie, in south west Scotland, that left 270 people dead on 21 December 1988.
Scottish Liberal Democrat leader Willie Rennie said Mr MacAskill's revelation contradicted previous statements on Scottish ministers' involvement in Tony Blair's prisoner transfer agreement with Libya.
FULL STORY: http://www.bbc.co.uk/news/uk-scotland-scotland-politics-36300894
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