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The bull case remains intact: Fundstrat's Tom Lee

Ebola. Sluggish economic growth. Ongoing turmoil in Iraq, among rising geopolitical tensions elsewhere.

It's no question there are plenty for investors to worry about these days, stock market strategist Thomas Lee told CNBC on Tuesday.

The bull case remains intact, though, as the fundamental story has not changed, the founder of Fundstrat Global Advisors said on "Squawk Box."

"We still have a U.S. recovery underway. We've got a tailwind coming from lower oil. You know, the weaker inflation. There's still a lot of capital on the sidelines. Companies have a lot of cash," Lee said. "So I'd say we're going to get through this rough patch, and I think we're still going to have a very strong finish to the end of the year."

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What's really spooked investors lately, though, has been concerns over slowing global growth. But Lee, drawing from his 25 years of experience on Wall Street, thinks those fears are overblown. He's sticking to his guns on his year-end target of 2,100 for the S&P 500 index.