In a statement carried by Kuwait's Kuna state news agency, Anas Saleh said the cabinet "stands in opposition" to an "unlawful campaign" against the kingdom and its reputation.
READ MORE: Saudi Arabia Vows Response to Any Sanctions Over Journalist's Disappearance
He said Kuwait would wait for results of the probe into what happened to Khashoggi – a known critic of the Saudi government – and would not allow the smear campaign to hurt bilateral ties.
Egypt, Jordan, Lebanon and the United Arab Emirates sided with Saudi Arabia on Sunday after warnings from US and UK leaders to punish it if the Turkish inquiry confirms its role in the suspected killing of the journalist who was last seen entering the Saudi consulate in Istanbul on October 2.