There was a lot of hand-wringing on Wall Street this month as the health-care replacement bill championed by Speaker Paul Ryan and President Donald Trump failed to even come up for a vote and stocks swooned. Scary superlatives were used in the financial media this Monday like: Dow's eight-day fall longest losing streak in eight years. But after a big comeback Tuesday, the S&P 500 stands just 1.5 percent from its record close. Right now, it seems like nothing can derail this rally. We talked to some investors and traders to find out what could actually take this market down.