This is the time when Wall Street tends to have some 'indigestion', says RBC's Lori Calvasina

Let's take a closer look at the markets. Joining us now, Lori Calvacina, RBC Capital Markets head of US equities strategy research. Lori, thank you uh for being here.So, you thought the summer rally did make sense, but you're more cautious heading into the fall. Why. >> Look, I think we're sitting at levels if you look especially at S&P 500 or NASDAQ 100.We're bumping up against prior valuation ceilings. We're also going into a tough period seasonally. September has been down, I think, three of the last fiv ...