A state district judge Friday evening granted a temporary restraining order blocking the implementation of a voter-approved charter amendment requiring the city of Houston to grant its firefighters “pay parity” with police officers of similar rank and experience. State District Judge Kristen Brauchle Hawkins granted the TRO Friday night at the request of the Houston Police Officers Union, which filed a lawsuit earlier in the day against the city and the Houston Professional Fire Fighters Association. The judge set a hearing for Dec. 14. The fire union opposed the TRO request, but lawyers for the city did not. The HPOU lawsuit seeks to block “Proposition B,” arguing it amounts to an unconstitutional amendment to Houston’s charter and was void from the start.