University of Pennsylvania President Liz Magill resigns following scrutiny on elite universities for alleged antisemitism; Representative Elise Stefanik demands ouster of Harvard President Claudine Gay and MIT President Sally Kornbluth; Harvard faces pressure from donors and alumni to address issues of leadership and antisemitism; Harvard declines to comment on Gay, while Gay apologizes for her words at the hearing; Harvard Jewish Alumni Alliance demands change and criticizes Harvard for prioritizing legal risk over student life.