Mexico will take Google to court if maps shown to US-based users continue to label the Gulf of Mexico as the Gulf of America across the entire body of water, President Claudia Sheinbaum said Monday, arguing that US President Donald Trump’s order to rename it only applies to the part of the continental shelf under US control.

The Mexican government has sent a new letter to Google asking it to change how the Gulf is listed after it claimed the company’s initial response was insufficient.

Sheinbaum shared a letter addressed to Google with reporters, arguing that the U.S. had no authority to unilaterally rename the Gulf.