Scooter Libby clemency controversy
The hearing was intended to "explore the grave questions that arise when the Presidential clemency power is used to erase criminal penalties for high-ranking executive branch employees whose offenses relate to their work for the President" , as well as to assess the consequences of the perjury and obstruction of justice of which vice-presidential Chief of Staff Lewis Libby was convicted March 6 , 2007 . 
<triplet> Lewis Libby <subj> obstruction of justice <obj> convicted of <triplet> convicted <subj> Lewis Libby <obj> defendant