You can’t make this stuff up.
The Senate sponsor of the legislation that would strip President Obama of prosecutorial discretion to stop unnecessary deportation (the HALT Act) is none other than the Senator with the most direct and personal knowledge of discretion: David Vitter.
Put simply, “Prosecutorial discretion” is the authority of an agency or officer charged with enforcing a law to decide whether to enforce the law in a particular case.
For example, you may recall that a few years ago, this Senator from Louisiana confessed to having committed certain “sins.” What he meant was that he’d engaged in the crime of procuring prostitutes via the DC Madam. Several of the women involved were prosecuted, but not Vitter. Prosecutors opted not to pursue his case. That is discretion in action.