Washington’s top diplomat will travel to Saudi Arabia on Sunday as the deadline approaches on a landmark — and, analysts say, long-shot — deal that would see the kingdom recognise Israel. US Secretary of StateAntony Blinken’s visit to Riyadh comes nearly seven months after the eruption of war in Gaza put the brakes on what was intended as a signature foreign policy achievement for his boss, US President Joe Biden. It also comes as Americans prepare to vote in November on whether to give the 81-year-old Biden a second term, an election process that could scramble what progress has been made o…