The Mexican official said that his country's senior leaders will also want to see a demonstration of "the respect that the relationship deserves, built over decades."

They'll also be looking for acknowledgment that Mexico is one of the US's biggest trading partners, on which millions of jobs depend, and that the US "is lucky to have such good neighbors."

The official also returned to a point of contention between Trump and Pena Nieto, saying that Tillerson and Kelly will receive a clear message to take back to Washington: Mexico will not pay for the wall.

Anger about that proposal is just one factor fueling consumer boycotts of US brands and goods in Mexico, where lawmakers have introduced a bill to stop buying US corn. Mexicans staged massive anti-US protests Sunday, forming human chains along the border where Trump would like to build a wall. Peña Nieto already canceled a trip to Washington to meet with Trump in apparent frustration over the new US leader's proposals and rhetoric.