Mexican President Enrique Peña Nieto has said he wants to work collaboratively with U.S. President-elect Donald Trump. Since the U.S. election, he hasn't commented on the wall publicly.
But his foreign secretary, Claudia Ruiz Massieu, has.
“We’ve been very clear on the fact that Mexico will never consider paying for a wall," she told PBS Newshour.
Legislation has been proposed at the Mexican Senate that bans the use of public funds on any project that is “against the country’s interest." That's widely taken to mean the wall.
"Just because of, you know, tantrums, we could really waste a golden opportunity of uniting," said Miriam Grunstein, an attorney and advisor to Mexican senators on energy and international law.
The proposed Mexican legislation would lead to a review of some of the most fundamental treaties between the two countries, among them the 1848 Treaty of Guadalupe. The treaty ceded Texas and California, as well as parts of Arizona, Colorado, New Mexico, Nevada, Utah and Wyoming to the U.S.
The bill also states, "In cases where the assets of our fellow citizens or companies are affected by a foreign government, as Donald Trump has threatened, the Mexican government should proportionally expropriate assets and properties of foreigners from that country on our territory."
Translated, it means that should Trump follow through on threats to expand the wall, withdraw U.S. participation in NAFTA or stop remittances. Mexico could target U.S. assets in Mexico — assets estimated by the Office of the U.S. Trade Representative at over $100 billion.
Ignacio de Moral, who supervises the federal government's economic development plans in the state of Veracruz, doesn’t believe it will ever come to this.
"It will take years, longer than he'll be president, to build a wall," he said in Spanish. "There won't be a wall."
Even senior U.S. politicians have cast a degree of doubt on the idea.
Texas Republican Congressman Pete Sessions has said the wall is “an analogy” for fences and drones. But in Mexico, the wall is part of a suite of political and economic threats against Mexico.
Jeff Abrego, a hedge fund manager in Mexico City, said Mexico’s wary after the U.S. election. "It's shaken the confidence here in the country from an economic standpoint right to its foundation, to its core," Abrego said.
The wall has become a staple on the country's talk shows. Luis Cárdenas told his audience on MVS Radio that not all Americans are like-minded. "It's not the entire U.S. that wants the wall," Cárdenas said on one broadcast. "Just a part."
But Mexicans are braced for some form of this campaign pledge coming true. José Arellano, who entered the U.S. illegally before returning, said one group of Mexicans wants the wall built: organized crime.
"More power to the mafias," Arellano said in Spanish.
Security analyst Alejandro Hope said an expanded wall will likely mean more bloodshed in Mexico, with organized crime fighting for control of smuggling routes into the U.S.
"The remaining routes for illicit trafficking will become far more valuable," Hope said. "And that probably means more conflict on the Mexican side." Hope has good contacts in the Mexican intelligence community. He served on former president Vicente Fox's transition team.
If the wall is substantively expanded, Hope said he believes it will also slow cooperation with the U.S. on existing arrangements on border security and immigration.
