Former Treasury Secretary Jack Lew on Yellen, Biden's economic agenda and more

Jack Lew, partner at Lindsey Goldberg, former Treasury Secretary and chief of staff to President Barack Obama, joined "Squawk Box" on Thursday to discuss why he signed a bipartisan letter with other former Treasury Secretaries endorsing Janet Yellen for the position, President Joe Biden's national plan to deal with the coronavirus pandemic as a way to spur economic recovery and tackling income inequality.