I do not know the process of getting a whole Department (or several departments) of the US government involved in any type of investigation. But if it works like academia, it starts at the top in all departments and filters down to the “grunts”.
But with Spygate investigation beginning in December 2015 during Obama’s tenure and months before Trump was an actual candidate, it boogers my imagination that anyone other than Obama would have ordered it to happen. He was the head of all the departments and only he could have done it. It is time to get all the documentation and if it is already out of “reach”, open heaven and hell to get it regardless.
It is really time to find out who Obama is and who put him in office. Again it would be heads of “departments.”
The whole Trump affair was so nefarious and underhanded and despicable, I would like to see the originators and doers of it hung.
Obama may have rubber stamped it, but he did not have the experience or intellect to come up with the idea. Your question about who put Obama in office is relevant. Those people came up with the idea. But remember too that this was mostly started by foreign "friendly" intelligence services. We don't know how much the US deep state coordinated in the beginning nor how much influence that entire cabal had on choosing Obama and getting him elected.