President Biden said what’s happening in Gaza “is not genocide,” doubling down on the White House’s support of Israel as the International Criminal Court prosecutor seeks arrest warrants for Israel’s prime minister and Hamas’s leader on charges of war crimes and crimes against humanity. About 40 percent of Gaza’s population has been displaced in the past two weeks, according to U.N. estimates —the vast majority, about 812,000, in a mass exodus from Rafah amid evacuation orders from Israel.