Democrats urge Trump to boost efforts to curb gun trafficking to Mexico / US sanctions Mexican cartel linked to drug trafficking / US imposes sanctions on a Mexican cartel linked to a drug trafficking and fuel-theft network / China and Mexico cited by US for financial networks enabling fentanyl trafficking / Mexican cartel leader's son is sentenced to life in prison for role in major drug trafficking plot / Cartel-plagued Mexican city pins hopes on Trump's anti-drug trafficking pressure / Mexican drug cartel leader extradited to the US to face federal drug trafficking charges / Arizona governor signs order to fight Mexican cartels, drug trafficking at border / Trump vows steep tariffs on Mexico, Canada and China over drug trafficking, migration