The nation's 10th largest school district plans an all-virtual start to the fall semester amid the Covid-19 pandemic.
The American Federation of Teachers, which represents 1.7 million school employees, issued a resolution on Tuesday saying it will support any local chapter that decides to strike over reopening plans.
Children need in-person instruction, she said, adding that remote instruction is no substitute for it. But she said teachers need to know they'll be kept safe.
Many are quitting, retiring or writing their wills.Along with strikes, the union said it will fight unsafe reopening plans through lawsuits and labor grievances.
The union's Florida chapter filed a lawsuit last week attempting to block the state's plan to reopen schools, which the suit called reckless and unsafe.