Earlier reviews had cast doubt on the idea that a foreign adversary was behind Havana syndrome, a range of symptoms that American spies and diplomats reported.
Actions taken by Tulsi Gabbard, the director of national intelligence, opened up the possibility that the Trump administration would take a new look at whether Russia or another power could be behind Havana syndrome
The president said he would nominate Jay Clayton, the U.S. attorney in Manhattan and the former chairman of the Securities and Exchange Commission, for the permanent role.