Up to half of Chicago police officers could be put on unpaid leave starting Friday due to a dispute between their union and Mayor Lori Lightfoot over a city demand for officers to The influx of firearms is 'ground zero for violence ' at the end of a bloody summer in Chicago At least 120 officers in San Francisco will be off the streets after failing to comply with the vaccination mandate of the city, CNN affiliate KGO reported . Eighty of the 120 police officers work in the department's patrol pision, said tracy mccray, vice president of the san francisco police officers association. In a message to the Chicago officers , their union president presented the issue as an employment dispute between the city and officers. I have made it clear my status with regard to the vaccine, but I don't think the city has the power to mandate anyone without talking about this information about your medical history and change the terms of employment so to speak on the fly, said John Catanzara, president of the local lodge of the Fraternal Order of Police (FOP). Earlier this month, l former union president has died of Covid . He was president from 2014 to 2017. Read moreThe officers in Chicago have a deadline of Thursday midnight to 'It's not the reviews that Chicago mayor remains optimistic after two eventful years If we suspect that the numbers are true and we get a large number of our members who remain firmly convinced that it is is overbreadth, and they're not going to provide the information in the portal or undergo any testing, so it's safe to say that the city of Chicago will have a 50% or less police force for this weekend at come to the top, said Catanzara. It's notnot because of the FOP, it is 100% because of the reluctance of the mayor to move from his hard line so whatever happens because of the manpower problem, it falls by the door of the mayor. Catanzara said the FOP would seek a temporary injunction against the city that would prevent them from carrying out the mandate, and said the union planned to file an unfair labor practice charge against the city for its inability to carry out the mandate. negotiating with the union on this issue. It is not clear whether the union followed through on either of these actions, and Catanzara did not respond to a request for comment. Lightfoot , at a press conference on Wednesday, said she welcomed a possible FOP lawsuit. There is threatening litigation. I say bring it, she said.