The White House has urged the two sides to continue bargaining in good faith, and says a supply chain task force is ready to help minimize the impacts. But officials have consistently said President Joe Biden does not plan to use his legal powers to try to force the parties to talk and end a strike, strengthening the union’s position.

The U.S. Maritime Alliance says it filed an unfair labor practice charge with the National Labor Relations Board alleging that the International Longshoremen’s Association is not bargaining in good faith.

The alliance said in a prepared statement Thursday that it filed the charge “due to the ILA’s repeated refusal to come to the table and bargain on a new master contract.”

The ports are asking for immediate relief, an order requiring the union to resume bargaining.

In an email, the NLRB said it is investigating the complaint. It’s unlikely that the board would make a decision until well after the strike deadline. The NLRB says typically it takes seven to 14 weeks to decide on the merits of a charge.