Dallas City Manager A.C. Gonzalez called the plan to hire 451 new police officers this year "extremely difficult if not impossible" in a memo to City Council members. 

Instead of increasing the police force, the city is expected to hire 300 new officers to replace those leaving, Gonzalez said in the financial forecast memo. 

Officers have been quitting or retiring from the Dallas Police Department in droves. In December, Interim Police Chief David Pughes told council members that 99 officers had left since October, the start of the fiscal year, the Dallas Morning News reports.