President Joe Biden’s demand this week that Israel improve humanitarian conditions in Gaza and support a ceasefire drew sharp attacks both from frustrated political allies who said the US president did not go far enough and opponents who said he went too far. On Thursday in a call with Prime Minister Benjamin Netanyahu, Biden threatened to condition US support for Israel’s offensive in Gaza on its taking concrete steps to protect aid workers and civilians. It was the first time that Biden, a Democrat and a staunch supporter of Israel, has sought to leverage US aid as a way to influence Israeli…