JERUSALEM — With elections a few months away, it is political fratricide season in Israel: From left to right, candidates are sticking knives in the ribs of their natural allies in hopes of elevating their own chances of succeeding Prime Minister Benjamin Netanyahu.

This week, the Zionist Union, a four-year-old liberal alliance, blew itself up as the Labor Party chief, Avi Gabbay, humiliated the veteran politician Tzipi Livni by abruptly breaking with her and her boutique party Hatnuah (The Movement) while television cameras rolled.

The popular ministers Naftali Bennett and Ayelet Shaked abandoned their right-wing party, the Jewish Home, to form a new one — the New Right — that they vowed would be less beholden to religious leaders but would still push to settle the West Bank and oppose a Palestinian state.

And a former army chief of staff, Benny Gantz, barged into the political center with a vague-sounding new party — Israel Resilience — and a still-to-be-announced set of ideas. It instantly threatened to siphon off support from more established moderate contenders like Yair Lapid and Moshe Kahlon, as well as another former chief of staff, Moshe Ya’alon.