It is DOJ's job to prosecute - but it is so political (donations to Clinton outnumbers Trump donations by 32 to 1) that there is nobody there with sufficient power that is in any way motivated to prosecute this wrong doing.

Justice Department donations this year favor Clinton to Trump 32-1 http://www.washingtonexaminer.com/justice-department-donations-this-year-favor-clinton-to-trump-32-1/article/2606256

Jeff Sessions has been neutralized.

Just look at all the people that stood by and allowed the FISA application to fo forward.
https://steemit.com/politics/@ozphil/how-deep-does-the-corruption-at-the-fbi-go

And Rod Rosenstein has reportedly threatened House members investigating these issues (Greg Jarret says he has 2 sources)
https://steemit.com/politics/@ozphil/rod-rosenstein-threatened-the-house-intelligence-committee-members