The controversy that FG just cannot seem to shake off

Why can’t they simply give an answer as to whether the Department of Justice and Ms Fitzgerald as the then minister knew what the then Garda commissioner was up to in May 2015?
This, we know, was the month that Nóirín O’Sullivan’s lawyers were questioning Garda whistleblower Sergeant Maurice McCabe at the O’Higgins Commission about the allegations he raised about the force.