Joe Biden is facing accusations of betraying a pre-election promise to re-evaluate ties with Saudi Arabia over the murder of Jamal Khashoggi in favour of pursuing a rapprochement with the kingdom aimed at repelling a challenge from China to US primacy in the Middle East. The charge, from human rights campaigners and some Democrats, follows the fifth anniversary of Khashoggi’s death at the hands of Saudi regime agents and comes amid mounting criticism of a proposed new defence treaty between Washington and Riyadh that could result in Saudi Arabia granting official recognition to Israel. Biden took office initially intending to…