RIYADH/ISTANBUL (Reuters) - U.S. Secretary of State Mike Pompeo met Saudi Arabia’s King Salman on Tuesday to discuss the disappearance of Saudi journalist Jamal Khashoggi, as Turkish police prepared to search the Saudi consul’s residence in Istanbul in a widening probe. Khashoggi, a U.S. resident and leading critic of the Saudi crown prince, vanished after entering the consulate on Oct. 2.