The Associated Press has announced

'The Associated Press has announced it will continue using 'Gulf of
Mexico' despite Trump's executive order renaming it Gulf of America'
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The AP establishes style guidance on the Gulf of Mexico and Mount
McKinley

The Associated Press sent its staff the following style guidance for
both geographic areas. We will use Gulf of Mexico, while acknowledging
the name Gulf of America in our copy.

We will also use Mount McKinley rather than Denali.

https://apnews.com/article/ap-style-gulf-mexico-mount-mckinley-denali-13bd46d636cef6f2608bd5d2c3d907ee