You could try and probably even find a lawyer or two that would take the case, with money up front.
Short answer is no, you can't sue. He was acting as a Federal government official at the time of the decisions were made. You need permission from
the government to sue it. Permission will never be given as it will set a flood of frivolous lawsuits from people and groups who are politically
motivated.
Bill Clinton was sued while he was president from actions he incurred while a governor, not President. He did not have this protection at a State
level.

