The FBI I know would never do this.
Oh, Come on. LBJ did the same thing to Nixon in the 1968 Presidential campaign. Johnson just could not make the information his DOJ gleaned public without Nixon knowing how he got it. (Illegal FBI Wire Taps)
FDR was as fond of sicking the IRS and FBI on his enemies as Obama is now.
That is the whole reason that President after President keep Jules Edgar Hoover on as the FBI Director decades after any other Bureaucrat would have been forced to retire because of age.
Hoover was just a weaseling little rat but regardless of which political party was in power, he was who ever was in the Oval Office's weaseling little rat, and when you are the President it is good to keep weaseling little rats like Hoover where you can either control or keep your eye on them. Men like Hoover, Himmler, and Beria are priceless to an ethically challenged politicians like the one that we now have in the Oval Office.