While most of Los Angeles sleeps, 58-year-old Melquiades Flores starts his day at 1 a.m., supervising the unloading of produce at M&M Tomatoes and Chile Company, the wholesaler he started in 2019. But the business that Flores hopes to pass to his children one day is bracing for a disruption.

President Claudia Sheinbaum also made clear that Mexico was prepared to respond with its own tariffs. “President Trump, it isn’t with threats or tariffs that we resolve the mi