No signs of a Santa Claus rally as stocks sell off into the close. Investors were spooked after the U.S. announced it will require travelers from China to show a negative covid test starting January 5th. Rosenberg Research President David Rosenberg discusses this year end sell off and why he is bullish on defense stocks. And Venture Capitalist Alexis Ohanian reveals his outlook for startups, crypto and tech regulation in the new year. Plus, he weighs in on Elon Musk's acquisition of Twitter and whether he'd be interested in becoming the next CEO of the social media company.