TEGUCIGALPA (Reuters) - The government of Honduras said on Friday it rejected comments by a Mexican minister that the “mother of all caravans,” with more than 20,000 people, was being organized in the Central American nation.

Honduran foreign minister Maria Dolores Aguero sent a letter to her Mexican counterpart, Marcelo Ebrard, calling the statements “unsubstantiated” and potential “triggers for illegal migration.”

Mexican Interior Minister Olga Sanchez Cordero told local press earlier this week that the government was aware that “a new caravan is being formed in Honduras that they call the mother of all caravans. They are thinking that it can be more than 20,000 people.”

The Mexican interior ministry did not immediately respond to a request for comment.

President Donald Trump threatened on Friday to close the U.S. border with Mexico next week, potentially disrupting millions of legal border crossings and billions of dollars in trade, if Mexico does not stop migrants from reaching the United States.

Trump has repeatedly vowed to close the U.S. border with Mexico during his two years in office but has not followed through.