Pete Najarian forecasts a pickup in volatility

CNBC "Halftime Report" trader Pete Najarian believes it's time for investors to get defensive.

During Tuesday's session, the options guru added the ProShares Ultra VIX Short-Term Futures ETF to his model portfolio, a leveraged instrument used by traders to get exposure to volatility.

In the past three months, as the market trended higher and volatility decreased, shares of ticker UVXY plunged nearly 70 percent.

Watch the video below to find out how Najarian is insulating his portfolio from a potential market decline.