Regeneron CEO on teaming up with Roche to develop Covid antibody cocktail

Regeneron and Roche are teaming up on an investigational antibody cocktail against COVID-19, with the U.S. company to sell it in the United States and the Swiss drugmaker to sell it elsewhere, should the drug win approval. Leonard Schleifer, co-founder and chief executive of Regeneron, joins "Squawk Box" to discuss the initiative.