The Chicago Teachers Union (CTU) will reportedly hold a strike authorization vote on December 9, according to NBC 5.
Earlier this month, the CTU held a "practice contract poll/mock strike vote," in which 97 percent of participants said "they will vote to authorize a strike, if needed," the union said.
CTU held the practice strike vote after learning that teachers could be laid off in early 2016 as part of a massive round of layoffs that could occur if the district does not get the $480 million in pension savings it is seeking from Springfield.
The union is also still in negotiations with the district over a new labor contract. CTU's contract with the school district expired on June 30.
In order to strike, CTU would need authorization from 75 percent of its members.