Market swings this year have temporarily quashed the optimistic case for stocks, long-time bull Tom Lee said Tuesday. But as negative sentiment piles up, stocks look poised to mount a stark reversal, he contended.

"I do think there's catalysts, you know, in the next few months developing. And I think that's why it's possible for the market to actually have a really nice rebound," the Fundstrat Global Advisors managing partner and head of global research told CNBC's "Fast Money: Halftime Report."