The U.S. Americans are practising a thing called "recall". Recently, a couple state senators were replaced by special elections that were triggered by petitions (that met a certain quantity requirement).
This made me think about something.
How about an automatic triggering of a special (potential recall) election for all federal politicians who supported military action without obvious self-defence character (= repelling an invading army, defending in air war or breaking a naval blockade) or unambiguously worded UNSC approval?
They wouldn't have to fear much if they have much popular support (= almost a necessity for successful modern warfare), after all!