It is a time-honoured tactic for the Opposition. Identify the weakest link on the other side and target them remorselessly. It is a bit like unravelling a jersey - find the loose string and pull it till the whole thing disintegrates. When in Opposition, National were merciless. Labour ministers including Marian Hobbs, Parekura Horomia and Judith Tizard were all made to look like fools at Question Time. Mark Burton also had his moments under the forensic probing of Bill English during the Electoral Finance Bill, to the point Annette King was drafted in to replace him.
Since National went into Government, Labour has tried to reciprocate in kind but has misfired. Attempts to kneecap Paula Bennett and Anne Tolley failed as Labour belatedly discovered they had underestimated them. Labour came closer with Hekia Parata but couldn't quite drive it home. Now they can clearly smell the scent of fear on a new herd straggler: Corrections Minister Sam Lotu-Iiga.
Lotu-Iiga had the misfortune of a big scandal breaking in his portfolio in his very first days in the job: the flight to Brazil of Philip John Smith.
Lotu-Iiga struggled to front on it in the heat of the moment. Brushing it off as an operational matter was never going to take him far as revelation followed revelation on Smith's escape and the ways he maximised his income, courtesy of the taxpayer, from behind bars.
Since then, Labour's Kris Faafoi and Kelvin Davis and NZ First's Ron Mark have targeted Lotu-Iiga with that Trojan horse of a question: Whether he stands by all his statements.