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We love it when a plan comes together! #solidarity #standwithCTU #faircontractnow https://t.co/o7Te9RyYAh

— ChicagoTeachersUnion (@CTULocal1) October 21, 2019

The CTU did not immediately respond to ABC News' request for comment about Lightfoot's letter, but there is slated to be an update on the negotiations Monday afternoon.

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