U.S. President Donald Trump wants to plug America's wealth into the stock market. The question is: where's he getting the cash? Andrew Chang breaks down what we know about a possible U.S. sovereign wealth fund and what it could mean for the trillions of dollars in U.S. debt. Images supplied by Reuters, Getty Images and The Canadian Press. (Additional credits: 6:55: NBC Chicago/YouTube; 6:58: Reuters/YouTube; Source: Economic Club of New York)