Nonsense. Did you really expect him to prosecute her? He needs to PARDON her. That way he looks merciful AND tars her forever as a pardoned felon.
I'll make an alternate suggestion:
Let the DoJ and FBI do their job, after appointing honest leadership and without political interference.
If Clinton is convicted, then commute her sentence -- if there is any penalty.
In the case of the classified emails, it's likely she'll be offered a plea to a misdemeanor charge of unlawful removal and retention of classified information. This is typical in a case like this -- because they don't have to show the information in open court to prove it is sensitive information. The usual sentence is a fine and probation.
Of course, Clinton may choose to be defiant ("laws are for little people"), but I don't think she's stupid enough to risk a prison sentence. The best she can hope for is a hung jury.
The IRS is already investigating the Clinton Foundation. That's confirmed, and not a rumor (like the alleged FBI investigation). Let them do their job, and the Foundation will likely be shut down.