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FILE- In this Monday, Jan. 11, 2021 file photo, elementary 1 teacher Melissa Vozar sits outside of Suder Elementary in Chicago to teach a virtual class. The Chicago Teachers Union said Sunday, Jan. 24 that its members voted to defy an order to return to the classroom before they are vaccinated against the coronavirus, setting up a showdown with district officials who have said such a move would amount to an illegal strike. (Anthony Vazquez/Chicago Sun-Times via AP, File)

FILE- In this Monday, Jan. 11, 2021 file photo, elementary 1 teacher Melissa Vozar sits outside of Suder Elementary in Chicago to teach a virtual class. The Chicago Teachers Union said Sunday, Jan. 24 that its members voted to defy an order to return to the classroom before they are vaccinated against the coronavirus, setting up a showdown with district officials who have said such a move would amount to an illegal strike. (Anthony Vazquez/Chicago Sun-Times via AP, File)

Chicago Teachers Union members and hundreds of supporters march through the Loop, Wednesday, June 24, 2020. The Chicago Teachers Union said Sunday, Jan. 24, 2021 that its members voted to defy an order to return to the classroom over concerns about COVID-19, setting up a showdown with district officials who have said such a move would amount to an illegal strike. (Ashlee Rezin Garcia/Chicago Sun-Times via AP)

Chicago Teachers Union members and hundreds of supporters march through the Loop, Wednesday, June 24, 2020. The Chicago Teachers Union said Sunday, Jan. 24, 2021 that its members voted to defy an order to return to the classroom over concerns about COVID-19, setting up a showdown with district officials who have said such a move would amount to an illegal strike. (Ashlee Rezin Garcia/Chicago Sun-Times via AP)

FILE - In this Monday, Jan. 11, 2021 file photo, elementary 1 and 2 teachers prepare their desks and laptops for a virtual class outside of Suder Montessori Magnet Elementary School in Chicago. The Chicago Teachers Union said Sunday, Jan. 24 that its members voted to defy an order to return to the classroom before they are vaccinated against the coronavirus, setting up a showdown with district officials who have said such a move would amount to an illegal strike. (Anthony Vazquez/Chicago Sun-Times via AP, File)

FILE - In this Monday, Jan. 11, 2021 file photo, elementary 1 and 2 teachers prepare their desks and laptops for a virtual class outside of Suder Montessori Magnet Elementary School in Chicago. The Chicago Teachers Union said Sunday, Jan. 24 that its members voted to defy an order to return to the classroom before they are vaccinated against the coronavirus, setting up a showdown with district officials who have said such a move would amount to an illegal strike. (Anthony Vazquez/Chicago Sun-Times via AP, File)

FILE - In this Monday, Jan. 11, 2021 file photo, teachers Adrienne Thomas, left, and Irene Barrera, right set up their computers and materials for their virtual classes outside of Suder Montessori Magnet Elementary School in solidarity with pre-K educators forced back into the building in Chicago. The Chicago Teachers Union said Sunday, Jan. 24 that its members voted to defy an order to return to the classroom before they are vaccinated against the coronavirus, setting up a showdown with district officials who have said such a move would amount to an illegal strike.(Anthony Vazquez/Chicago Sun-Times via AP)

FILE - In this Monday, Jan. 11, 2021 file photo, teachers Adrienne Thomas, left, and Irene Barrera, right set up their computers and materials for their virtual classes outside of Suder Montessori Magnet Elementary School in solidarity with pre-K educators forced back into the building in Chicago. The Chicago Teachers Union said Sunday, Jan. 24 that its members voted to defy an order to return to the classroom before they are vaccinated against the coronavirus, setting up a showdown with district officials who have said such a move would amount to an illegal strike.(Anthony Vazquez/Chicago Sun-Times via AP)