"We, on the part of President Biden's administration, have worked from the beginning with this paradigm, knowing that if these problems are going to be solved, we are going to have to work as partners," says the US ambassador to Mexico, Ken Salazar, during a press conference in Mexico City. Salazar makes the comments a day after US president-elect Donald Trump warned he intends to impose sweeping tariffs on goods from Mexico, Canada and China in response to illegal drug trade and immigration. IMAGES AND SOUNDBITES