As tensions with North Korea escalate, Wall Street ex-bull Tom Lee is ‘worried’

The market may appear to be shrugging off escalating tensions with North Korea, but Wall Street strategist Thomas Lee believes investors shouldn't get too comfortable.

Lee, who had been one of the Street's most bullish strategists but is now among its most bearish, doesn't see a great risk reward and is urging clients to use discipline in the stock market.

"What gets us worried is that these geopolitical tensions have a chance of escalating at a time when I think Washington is not running like a smooth machine," Fundstrat Global Advisors' co-founder said Wednesday on CNBC's "Trading Nation."

"With a fiscal cliff coming and some major reform bills that investors have been banking on, I think it does create sort of the kind of headline events that could end up triggering a big jump in volatility."

The major indexes are coming off their second negative session in a row. The S&P 500, Dow and Nasdaq fell by fractions of a percent, but they're still up at least 15 percent since the November presidential election.

"You'd expect investors to be taking some action. I think it really speaks to ownership of the equity market today — that passive funds aren't necessarily going to react to headlines like this," said Lee.

He expects the S&P 500 to fall by 8 percent to 2275 by year's end and doesn't see any major catalysts to drive stocks higher.

"We don't necessarily have a major election on the horizon or any major deadlines," he noted. "It's still going to be a market where you want to be more focused on sectors than banking on a big move in the indexes."

And, he said there's one area in particular that could give investors solid returns in this environment.

"We still like overweighting FANG," he said, referring to tech stocks Facebook, Amazon, Netflix and Google parent Alphabet. "I think FANG are true sector innovators."

Lee also has a sector pick that's been out of favor.

"Some of the laggards, the pariahs of this market, are the ones which really interest us. Telecom services, for instance, is one of the worst sectors this year," Lee said. "There's a potential catalyst coming with the FCC deciding what to do with Title II which is net-neutrality. Their final word is expected before the end of this year."

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Sara Eisen

Sara Eisen joined CNBC in December 2013 as a correspondent, focusing on the global consumer. She is co-anchor of the 10AM ET hour of CNBC's "Squawk on the Street" (M-F, 9AM-11AM ET), broadcast from Post 9 at the New York Stock Exchange.

In March 2018, Eisen was named co-anchor of CNBC's "Power Lunch" (M-F, 1PM-3PM ET), which broadcasts from CNBC Global Headquarters in Englewood Cliffs, N.J.

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