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A three-member Democratic panel of the NLRB said it would recognize a union organized by more than 500 employees at Trump International Hotel Las Vegas.

The Trump hotel workers voted to join the Culinary and Bartenders Union in December 2015, but the company appealed the election results. On Thursday, the NLRB said it would uphold the decision of the agency’s regional director.

The board’s lone Republican did not participate in the decision.

"The request for review is denied as it raises no substantial issue warranting review,” the NLRB wrote in its decision.

Trump’s hotel argued that the workers were coerced into organizing by the culinary union. It could appeal the NLRB’s decision in court or agree to negotiate with the union.