Sen. Elizabeth Warren (D-Mass.) is calling for Harvard to cut ties with the school’s former president and former Treasury Secretary Larry Summers, after the extent of Summers’ friendship with Jeffrey Epstein was laid bare in a document dump from Epstein’s estate last week. Summers’ messages appeared regularly in Epstein’s inbox, even after the billionaire financier pleaded guilty to soliciting sex from underage girls in Florida in 2008. In several emails reviewed by The Harvard Crimson ,