A map labeling Lake Ontario as "Lake America" is displayed as President Donald Trump speaks after signing an executive order. Andrew Harnik/Getty Images

First, the Gulf of Mexico, then Lake Ontario. Now, President Donald Trump has said an ocean could be next.

At a Mississippi rally on Monday, the president floated the idea of renaming the Atlantic Ocean the "American Ocean" and said he thinks "Europe will be thrilled."

He first raised the idea at a Tennessee rally in early October, pitching "Trump Ocean" or "Ocean of the Americas" for either the Atlantic or Pacific.…