Karen Lewis

The Chicago Teachers Union has to give 10 days' notice before staging a walkout.

If a strike is authorized, teachers could walk off the job as early as October.

If teachers were to strike this year, they would likely walk off in mid-October, according to reports.

Chicago Teachers Union spokeswoman Stephanie Gadlin accused CPS of lying and ignoring new revenue ideas.

They instead will focus on pressuring the city and state to properly fund Chicago Public Schools.

Rauner's Press Office responded: "This kind of rhetoric has no place in American public discourse."

"No teacher ever wants to go on strike," Lewis said Monday. "But this board leaves us no choice."

"The countdown has started" for a teacher strike, union officials said Saturday.

Karen Lewis earned another three-year term as president when no one ran against her.

Chicago Teachers Union President Karen Lewis rallied thousands by saying Gov. Rauner "can't stop us."

Teachers are on a one-day strike, and other groups joined to try to "shut it down" across the city.

Gov. Bruce Rauner is being painted as the villain during this strike.

Fast-food workers and SEIU Healthcare Illinois made plans for Friday's strike and protests.

Teachers called on CPS CEO Forrest Claypool to "join them in this courageous day of action" next Friday.

The Chicago Teachers Union will hold a news conference after its House of Delegates meeting Wednesday.