New York City, the largest school district in the country with 1.1 million students, is also the only big-city school district planning to open its doors to students — albeit on a hybrid schedule with virtual learning — on time this fall. But at a press conference Wednesday, the president of the city's largest teachers unionsaid the mayor needs to make major changes to meet the union's criteria for safe reopening.

"We don't believe it is possible for schools to open on Sept. 10," said Michael Mulgrew, president of United Federation of Teachers, whose members include about 75,000 of the city's teachers, as well as other school staff.

If schools do open, he warned, "It might be one of the biggest debacles in the history of the city."

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