Khaled Hroub talked to Margot Patterson about the evolution of Hamas, the Oct. 7th attack on Israel, and the ceasefire plan proposed by President Biden to end the war in Gaza. A professor of Middle Eastern Studies at Northwestern University in Qatar, Hroub has studied and written about Hamas for 25 years.  His essay about the Oct. 7th Hamas attack appeared in the recently published book "Deluge: Gaza and Israel from Crisis to Cataclysm."