the weakest link in your opponents(Opposition research has always focused on the weakest link in your opponents. This is usually individual candidates and what they have previously said or done. // CNN, 2019 Alex_Odeychuk)
kritik(A "kritik" or "K" (which derived from the German word) is a form of argument often used in policy debate that challenges a certain mindset or assumption made by the opposing team. Val_Ships)