I think the way one should approach these kinds of questions is to look at how responsible government and the constitutional conventions that inform our basis of government are formulated. The Prime Minister is responsible for determining whether or not he has confidence in a given minister to carry out his or her duties as a minister. The Prime Minister can seek the resignation of any given minister at any time if he feels that person no longer carries the confidence placed in him or her.
In terms of specific considerations on any given case, I think a whole set of issues and factors go into determining what kind of a response is appropriate. I'm not in a position to comment on a specific incident around cheques. I think the testimony of the Clerk of the Privy Council, along with the Secretary of the Treasury Board, before the operations committee of the House of Commons two weeks ago more or less sets out the perspective of the Privy Council Office.