The Next Tax Battle: 'Gig tax' targets payment app users

Steve Rosenthal, Urban-Brookings Tax Policy Center senior fellow, and Erica York, Tax Foundation senior economist, join 'Squawk Box' to discuss the battle over the so-called 'gig tax', which requires third-party payment apps like PayPal and Venmo to send 1099 forms to anyone reporting business income over a certain threshold.