Israeli Prime Minister Benjamin Netanyahu is to deliver a landmark speech to the US Congress this week, a visit that has now been thrown off balance by President Joe Biden’s decision on Sunday not to seek re-election. Israel’s longest-serving premier will on Wednesday become the first foreign leader to address a joint meeting of the two chambers four times – pulling ahead of Britain’s Winston Churchill on three. But analysts say the war on Gaza has created worrying tensions between Israel and the United States, its main military and diplomatic backer, with Washington pushing Israel to seek a c…