The US government has a lot of debt, about $19 trillion of it. That's a huge, intimidating number on the face of it, but according to Scott Brown of Raymond James, it's also not a serious issue. "Just when you thought all the fear-mongering had subsided, the national debt has resurfaced as a topic in this year's presidential race," Brown said Monday in a note to clients. NOW WATCH: FORMER GREEK FINANCE MINISTER: The single largest threat to the global economy