The 25% tariffs, which Trump first threatened in November to demand Mexico and Canada stem the flow of fentanyl and illegal immigrants into the U.S., were among the first foreign policy obstacles for Sheinbaum, who took office in October as Mexico's first woman president and promised to keep a "cool head" during tariff talks.

President Donald Trump said this week that tariffs on U.S. neighbors Canada and Mexico will arrive Saturday. The two nations are not only close geographically, but economically as

Tariff retaliation: Mexico and Canada immediately vowed to impose tariffs of their own. The Canadian prime minister, Justin Trudeau, announced retaliatory tariffs starting with 25 percent tariffs on approximately $20 billion worth of U.S. goods on Tuesday, with $85 billion more to follow within three weeks.

Mexico has started deploying soldiers to its northern border in accordance with the 10,000 troops it promised to send to the border under a deal made with President Trump.

Markets are betting Mexico can keep buying off trade threats with border cooperation. But President Claudia Sheinbaum is still grappling with her country’s own problems.

Claudia Sheinbaum, Mexico’s first female president, has made concessions to President Donald Trump on immigration and fentanyl. But she’s also firing back.