Mexico's president sarcastically said that the U.S. should be called "Mexican America" after Trump's vow to rename the Gulf of Mexico the "Gulf of America."

The President of Mexico, Claudia Sheinbaum, wasted no time trolling President-elect Donald Trump, posting a vintage map showing that a large portion of what is now the United States of America used to be called “Mexican America.

President-elect Donald Trump said Tuesday that he would move to try to rename the Gulf of Mexico to the “Gulf of America.”

President Claudia Sheinbaum of Mexico also said Donald Trump was ill-informed when he said Mexico was “essentially run by the cartels.”

Donald Trump, who will officially become the US President on January 20, has made controversial claims about "Gulf of Mexico", Canada, Greenland and Panama Canal.

The Mexican president responded to President-elect Trump's contention that the sea should have a more U.S.-centric designation by showing a map from 1607 during a Wednesday press conference. The map, which predates the founding of the United States by more than 150 years, labels all of North America as "América Mexicana” (“Mexican America”).

Claudia Sheinbaum's suggestion came in response to Trump's proposal to rename the Gulf of Mexico as the "Gulf of America."

U.S. President-elect Donald Trump wants to rename the Gulf of Mexico the “Gulf of America.” Mexico’s president, Claudia Sheinbaum, came up with her own proposal. CNN’s Becky Anderson explains.