The union slammed Boeing’s “non-negotiated offer” and accused the company of trying to drive a wedge between itself and the striking workers.

Boeing and its largest union said they would continue contract talks on Tuesday, as both sides seek an agreement to end a strike by around 33,000 U.S. West Coast factory workers. The company and the union,

Boeing and IAM union leaders are set to resume negotiations on Monday, three weeks after 33,000 workers went on strike.