Top trader Lebenthal getting nervous, buys hedge

"Halftime Report" trader Jim Lebenthal is getting nervous about the stock market right now so he purchased an exchange-traded fund to protect the 9 percent year-to-date gain in his CNBC Pro model portfolio.

The trader Thursday bought shares of the ProShares VIX Short-Term Futures ETF, which rises in value when futures for the CBOE Volatility Index increase.

Watch the video below to find out why Lebenthal made the move.