CHICAGO (CBS) — The head of Chicago’s Teachers Union is far from pleased about president-elect Trump’s pick for education secretary.

Trump plans to add charter school advocate, Betsy Devos to his administration.

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Teachers Union President, Karen Lewis is concerned Devos might try to override union contract agreements that put a cap on the number of charter schools.

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“Don’t ask me why they picked her,” Lewis said. “I know know who put her name on the list, but she’s a nightmare.”

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Lewis said the Obama Administration’s Department of Education was far from a walk in the park and vowed to fight against bad policies.