If “no reasonable prosecutor would bring” a case against Hillary, who approved the Trump Tower #wiretap?

Jail CellIf we are to believe that the Judicial Department and the NSA are bastions of reasonableness, who approved the Trump Tower #wiretap and why?  I am hoping that this is fake news but considering the Flynn leak was classified information you have every right to be suspicious. This action has to be at least as stupid as Ms. Clinton having a private email server, the IRS targeting of conservative groups, and Ms. Rice going on five Sunday morning talk shows and saying the YouTube movie caused the Benghazi attack. At some point, you have to start prosecuting to cut down on the stupidity.