The Trump administration has accused Gustavo Petro of enabling drug cartels and placed him on the U.S. Treasury's Office of Foreign Assets Control (OFAC) sanctions list.
Rare earth elements, the unusual metals inside nearly every piece of high-tech equipment you can think of, are essential to modern life. In 2015, Lesley Stahl visited the California mine where they were first identified and learned how China became the dominant producer.
