On July 24 three senior U.S. State Department officials visited Cuba and met with the staff at the U.S. Embassy in Havana. They were the Interim Secretary for Western Hemisphere Affairs, Francisco Palmieri; the Assistant Deputy Secretary of Administration, William Todd,; and the Undersecretary of Diplomatic Security, Michael Evanoff.
They also met with the Director General of the United States of the Cuban Foreign Ministry, Carlos Fernández de Cossío.
Afterwards, Sr. Cossio said the U.S. is “manipulating this issue politically and irresponsibly. The State Department has behaved with a lack of transparency and cooperation, despite the insistent claims of Cuba to seek a response in a cooperative and comprehensive manner, given the reports that the State Department says it has received from its diplomats, but for which it has not shown the slightest evidence.”
Julia Mason, spokeswoman for the State Department, said, “The trip provided an opportunity for our senior officials to gain a deeper insight into the challenges posed by these attacks and their impact on US operations in the field.”
CBS News reports that a spokesperson for Senator Bob Corker (Rep., TN), the Chair of the Senate Foreign Relations Committee, has said that the State Department Accountability Review Board has “recently completed” a report on the case, as the committee awaits a briefing on it.
“There should be additional hearings in Congress about this,” says Daniel Runde, senior vice president at the Washington-based Center for Strategic and International Studies. Worried about future attacks on U.S. diplomats, Rude says, “This needs to stop. This is outrageous. I think it is a significant danger.”
Cuba repeatedly has denied any responsibility and has said the U.S. has manipulated the “alleged health incidents” for political purposes. 
 Goméz, Officials of the State Department in Cuba to discuss alleged incidents with the health of their diplomats, Cubadebate (July 24, 2018); Surprise visit of senior US officials to Havana for the ‘health incidents, Diario de Cuba (July 25, 2018); Dorsey, Top State officials visit Cuba, probe new health “attacks,” CBS News (July 24, 2018).
 Previous posts about the health incidents of U.S. diplomats in Cuba and more recently in China are listed in the “U.S. Diplomats Medical Problems in Cuba, 2017-18″section of List of Posts to dwkcommentaries–Topical: CUBA.