A month after losing a landmark antitrust case brought by the Department of Justice, Google is headed back to court to face off for a second time against federal prosecutors.

Google this year offered to sell its advertising marketplace Ad Exchange, or AdX, to end an EU antitrust investigation. But European publishers rejected the proposal, Reuters reported this week . The news agency cited two people with knowledge of the matter but did not name them.

Alphabet unit Google won a legal challenge on Wednesday against a 1.49 billion euro ($1.7 billion) European Union antitrust fine, while Qualcomm failed to repeal a penalty.