PS said Lisbon mayor Carlos Moedas has little weight in the national government, despite his public criticism of government policy. Moedas continued to demand an end to 'Volta.' A central issue in the dispute is Portugal’s national system for depositing and refunding beverage packaging. The scheme was launched in April and covers eligible drink containers. Consumers can receive a refund when they return containers, with recycling also forming part of the model. Moedas has criticized the program, while PS is trying to reduce the political impact of his objections.