Facing a major budget deficit, Chicago Public Schools officials suggested to board members Tuesday that they could delay some of the hard-fought guarantees in the just-ratified contract agreement with the teachers union — a suggestion that immediately resulted in a union threat to sue.

In a letter to board members obtained by WBEZ, the Chicago Teachers Union called the idea “vindictive sabotage” that would result in “recommendations that will subject the district to legal action.”

The school district and board members are looking for ways to address a $529 million budget shortfall, which doesn’t even include an additional $175 million pension payment the city wants CPS to cover. The school district’s fiscal year ends June 30, though the deadline for approving a budget for the upcoming sc

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