The viability of a U.S.-backed proposal to wind down the 8-month-long war in Gaza was cast into doubt after Israeli Prime Minister Benjamin Netanyahu said he would only be willing to agree to a “partial” cease-fire deal that would not end the war. His comments, made in an interview with a pro-Netanyahu Israeli TV channel late Sunday, sparked an uproar from families of hostages held by Hamas. Netanyahu’s comments did not deviate dramatically from what he has said previously about his terms for a deal. But they they come at a sensitive time and they could represent another setback for mediators trying to end the war.