Why Tom Lee raised his S&P target to 3,800

Tom Lee, Fundstrat Global Advisors, joins 'Power Lunch' to discuss why he's increasing his 2020 bull case for the S&P 500 and how investors can navigate the uncertainty. I think there's a feeling because stocks have moved so much since March, they're topping, says Lee. But we have to keep in mind, we went through the biggest stress test for stocks in five lifetimes, and they survived. I think that argues P/Es are going to expand pretty dramatically in the next couple years, he adds.