noun
political suicide
Refers to a politician or political group destroying their own career or standing through their actions or statements.
そのスキャンダルは大臣の政治的自滅を招いた。
The scandal led to the minister's political suicide.
彼の過激な発言は政治的自滅だった。
His radical remarks were political suicide.
自滅 means self-destruction or ruining oneself in general, while 政治的自滅 specifically refers to political self-destruction.
Compound of 政治的 (political) + 自滅 (self-destruction).