today is the deadline for officers to tell the city if they've been vaccinated against covid or be put on unpaid leave. but the union says the requirement will lead to many officers being off the streets at a time when gun violence is skyrocketing. omar jimenez reports. >> our institution is that people will comply. >> reporter: chicago mayor lori lightfoot is doubling down. >> it's pretty straightforward. are you vaccinated or not? if you are, you up load your information. if you're not, then you go to a separate page and you indicate that, and that you'll be taking the testing option. >> reporter: at the center of it all is the city's requirement to disclose vaccine status by friday. city employees, including police officers who don't comply, would be placed on unpaid leave. >> do not fill out the portal information. >> reporter: the president of the police union claimed this week, without corroboration, it could lead to a police force at 50% or less this weekend. now telling officers to refuse direct orders on the mandate