David Mundell was asked whether he knew of the existence of the phoney memo which was leaked under the instruction of Alistair Carmichael when both were ministers at the Scotland Office.
Mundell gives a confused and nervous response. He at first appears to avoid the question by denying involvement in the leak.
When pressed he stammers and stutters his way through the simple question.
Is he hiding something? Listen for yourself:
Related Article: Re-running a Salmond smear will not save Carmichael