In Tijuana, trucks drive through and people walk across the US border into the state of California, as Mexicans worry about after Donald Trump vowed to impose sweeping tariffs on goods in response to illegal drug trade and immigration. "We know that the Mexicans are the ones who go and do the work, the ones who bring the labor," says a 72-year-old homemaker. "If they throw all those people out, who's going to do those jobs?" she adds. IMAGES AND SOUNDBITES