Wiktionary
circular firing squad
n. (context idiomatic English) A political party or other group experiencing considerable disarray because the members are engaging in internal disputes and mutual recrimination.
Usage examples of "circular firing squad".
Following the incident, Aloha, Boeing, and the FAA formed a circular firing squad.
And, since there were various war engines atop the towers now occupied by either side, the keep was shooting at itself, in the finest traditions of the circular firing squad.
I'd given them a short course of basic training with the weapons, but evidently, I had forgotten to explain the futility of the circular firing squad.