..then Holder should be impeached for dereliction of duty for not prosecuting a this individual, but of course he won’t.
The law just doesn't work for the political class and their operatives.
If forced to prosecute, they would be found innocent or guilty only of minor infraction. They are thus protected from double jeopardy during the next administration
The next administration will never prosecute because they do not want to establish a precedent where prior administrations are punished for their violations. They know that they will soon be the prior administration.
They know by now that they are free to be as corrupt as their character, morals, ethics, and values will allow.
That is why it is important to select wisely when choosing leaders.