Mexican troops inspect vehicles entering the United States as part of a 10,000-member deployment that President Claudia Sheinbaum promised US counterpart Donald Trump in exchange for a one-month delay of his tariffs. "It's necessary, particulary given there is more interest here now in preventing the trafficking of fentanyl," says one Mexican crossing the border at the Otay Mesa Port of Entry in Tijuana. More than 3,000 members of Mexico's National Guard have been deployed in the state of Baja California, the most of any state bordering the US. IMAGES AND SOUNDBITES