U.S. tariff threat backs Mexican president into corner, facing Trump

By Dave Graham

MEXICO CITY, May 31 (Reuters) - U.S. President Donald Trump's threats to slap punitive tariffs on all Mexican trade if Mexico does not stop illegal immigration has punched a gaping hole in his Mexican counterpart's hands-off approach to diplomacy, with potentially ruinous consequences.

Mexico could face a severe economic shock if Trump makes good on a pledge to impose escalating tariffs of 5% on all Mexican goods from June 10 if the country does not halt a recent surge of migrants from Central America crossing the U.S. border.

The news, delivered in a tweet on Thursday evening, battered the peso and fueled concern about President Andres Manuel Lopez Obrador's reluctance to engage in foreign affairs or push back against Trump on his touchstone issue of illegal immigration.

It also raised fears that the Republican president will keep attacking Mexico as he seeks re-election next year.

In power since December, the leftist Lopez Obrador has tried to deflect Trump's barbs, insisting that the best way to tackle migrant flows is by jointly fostering development in Guatemala, Honduras and El Salvador, where most of the migrants apprehended on the U.S. border come from.

Trump has shown no enthusiasm for the idea.

In his day-to-day business, the 65-year-old Mexican president has stayed focused on domestic issues, pursuing a nationalist agenda of economic self-reliance and putting the brakes on foreign investment in the oil industry.

Foreign policy has been largely left in the hands of Foreign Minister Marcelo Ebrard, who has been dispatched to Washington to persuade the Trump administration to back down.

"Lopez Obrador doesn't want to get involved in this, but it's impossible to avoid," said former foreign minister Jorge Castaneda, a longstanding critic of Lopez Obrador, who says he has failed to grasp the significance of the U.S. relationship.

"Relations with the United States in Mexico are not a foreign policy issue. They are a domestic policy issue."

Around 80 percent of Mexico's exports are sent to the United States, whose businesses by far account for the biggest source of foreign direct investment to the country. U.S. business groups and lawmakers have said tariffs could be devastating to both countries.

Lopez Obrador told his morning news conference on Friday he believes the U.S. government will ultimately "rectify" its position. Asked if he would change the country's migration policy to accommodate Trump's request, he said Mexico is already tackling the problem.

Mexican officials have signaled they will respond in kind if Washington actually imposes tariffs, steps likely to target regions with high concentrations of Trump voters.