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As I understand it, the President has unfettered authority to pardon anyone he wishes. However, there is one person he cannot pardon - himself.
While he may issue a blanket pardon for a large category of people, he will actually make it easier for a prosecutor in the future to bring charges against him. With no further fear of their own prosecution, the witnesses from his administration will be required to cooperate with various subpoenas for their information.
So, we probably would not be able to get accountability for most of the people who should be held accountable. But the person who is ultimately responsible still can be.