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Separately, a group of attorneys general from nine states also demanded the NLRB withdraw its complaint.
Mr. Reid said in his statement the GOP opposition sprang in large measure from the party’s hostility to labor unions.

“Let’s be honest: Republicans are threatened by unions,” Mr. Reid said. “They’re threatened because when a large, organized group is so concerned with workers’ rights, the members of that group vote in large numbers. And because Republicans and the big businesses they defend so often try to take away workers’ rights, workers don’t often vote Republican.”