I'll just add that the minimum requirement under section 7 of the charter is something called “procedural fairness”, where you know you have to tell the person the case against them so they have a fair opportunity to respond.
In this section it says whatever “the Minister considers relevant”. The person who's going to be affected by that decision will have to be told ahead of time what factors the minister is considering. Otherwise it's going to result in an unfair decision, the Federal Court will set it aside and quash the minister's decision, and we'll have to do it all over again.