Hot-button

Colonizing Mars is just starting to become a hot-button issue.

Source: tatoeba (796808)

The online chatter about hot-button issues is reaching a fever pitch.

Source: tatoeba (8299248)

As is usually the casee when the use of stimulant medications like Ritalin makes it into mainstream media, the [Sroufe] piece pushed emotional hot-buttons in a way that would scare the daylights out of uninformed readers and lead them to avoid ever using such medications or allowing their children to, thereby giving up on a class of medications with enormous potential benefits.

Source: wiktionary

What will trigger my hot-button?

Source: wiktionary