The murder of Jamal Khashoggi by Saudi officials in Istanbul was a "state killing" that should prompt world leaders to reconsider having the Group of 20 summit in Riyadh next year, according to the U.N. expert who investigated the columnist's death.

"The killing of Mr. Khashoggi met all of the characteristics of a state killing," Agnes Callamard, the United Nations expert assigned to investigate Khashoggi's death, said at the Brookings Institution in Washington on Tuesday. That means the annual G20 gathering "doesn't happen or it moves elsewhere" so nations aren't "complicit" in the crime.

The summit is scheduled for late November 2020.