Trump said he was given no prior notice of the layoffs, a move that added "insult to injury," the lawsuit said. The seashore casino is one of the poorest performers in Atlantic City, which began the year with 12 casinos. Trump Plaza booked less than half its rooms in the first quarter of 2014, and had the lowest gaming revenue of any of the city's casinos in May. Its expected closure follows a series of blows for Atlantic City and could leave the city with a third fewer casinos than at the start of the year. The Atlantic Club casino was sold and shut down in January. Showboat, one of Atlantic City's largest properties, has announced it will close at the end of August. A bankruptcy auction is scheduled for Thursday for the $2.4 billion Revel casino, the city's newest, which has said it could close Aug. 18 if a buyer is not found. Neither the Atlantic Club, the Showboat nor the Revel are tied to Trump.