Zhèwèi guānyuán dǎogē xiāng xiàng, gōngkāi pīpíng zìjǐ de zhèngdǎng.
The official turned against his own side, publicly criticizing his own party.
Tips
history
倒戈 literally means 'to reverse the spear' — pointing your weapon back at your own army. It comes from ancient Chinese military history describing soldiers who turned against their own commanders.