If S&P goes below 3,800, we may have to put Santa's face on a milk carton, says UBS's Cashin

Art Cashin, UBS director of floor operations, joins 'Squawk on the Street' to discuss Thursday morning's market action, previous December equity rallies and his thoughts on David Tepper's recent comments on U.S. equity markets. For access to live and exclusive video from CNBC subscribe to CNBC PRO: https://cnb.cx/2NGeIvi