U.S. President Joe Biden on Saturday differed with Saudi Arabia in their account of discussions at a bilateral summit about the 2018 murder of Saudi journalist Jamal Khashoggi, a major point of contention between the two countries. U.S. intelligence agencies believe Crown Prince Mohammed bin Salman ordered the killing in 2018 of Khashoggi, a Saudi insider-turned-critic who had been living in self-imposed exile in Virginia. The de facto Saudi ruler denies it. Answering reporters as he arrived at the White House from his first Middle East trip as president, Biden disputed the Saudi foreign minister's account that he did not…