I don't know that there is a legal answer to that question. It seems to me that it resides in the domain of politics.
It is not obvious to me within a framework of law how a process that is already set up in law could be halted or under what legal authority the Prime Minister's Office might have acted to do that. The Prime Minister's Office did not have operational or, ordinarily, legal authority to manage the resettlement process at all, so from my perspective, I think the answer must reside in the domain of politics. I have not seen any explanation of the sources of legal authority to do what I understand the PMO did, but beyond that I don't know that I could elaborate.