Trump threatens car import tariffs in new warning to Mexico

After backing away from a threat this week to immediately shut the border to stop a surge of migrants from Central America, Trump raised the specter of a 25-percent tariff on cars as a possible tool he could use to force Mexico to halt illegal immigration and drugs."Before we close the border we'll put the tariffs on the cars.Earlier, Trump said he would give Mexico "a one-year warning" to stop drug trafficking, or face tariffs.