Poland's first tribunal crisis (2015-2016)
The incoming Law and Justice government refused to seat judges elected by the previous parliament and passed laws changing how the tribunal operated. The court's ability to review legislation was effectively frozen.
The dispute paralysed the tribunal and set off a multi-year confrontation with the European Commission.
European courts later ruled the tribunal was no longer independent, a finding the current government now uses against it.
The same blocking manoeuvre is now being used in reverse, by judges elected under the current majority against PiS appointees.
