Please make an argument which makes a minimum sense. Are we to discriminate individuals on the basis of nationality in such a stark manner and why? Shouldn't we hire experts or teachers from foreign lands, and why not?
No doubt, nationality and allegiance come into play in this discussion but that relates to the role and position vis a vis the intended benefits or the legal conflicts and loopholes.
If you have a valid argument that federal government cannot seek specialized advise from a foreign national or it cannot delegate some powers to an individual for a certain task please, bring it forward. Presently, this is being weighed in the court as well. There are certain reasons that rules of business had allowed such administrative appointments and an acute dislike of Zulfi Bukhari has no place in this decision.
If we were to go by your notion of stark prejudice and discrimination, tomorrow someone may argue that a resident of one province be disallowed to work in another, with similar words and vigor.