He did not cut the office. It was merged with 2 other offices that had the same mission.
Tim Morrison, former senior director for counterproliferation and biodefense on the NSC,
explains the streamlining of departments and offices that took place to increase efficiency.
It has been alleged by multiple officials of the Obama administration, including in The Post, that the president and his then-national security adviser, John Bolton, “dissolved the office” at the White House in charge of pandemic preparedness. Because I led the very directorate assigned that mission, the counterproliferation and biodefense office, for a year and then handed it off to another official who still holds the post, I know the charge is specious.
. . . . It is true that the Trump administration has seen fit to shrink the NSC staff. But the bloat that occurred under the previous administration clearly needed a correction. Defense Secretary Robert Gates, congressional oversight committees and members of the Obama administration itself all agreed the NSC was too large and too operationally focused (a departure from its traditional role coordinating executive branch activity). As The Post reported in 2015, from the Clinton administration to the Obama administration’s second term, the NSC’s staff “had quadrupled in size, to nearly 400 people.” That is why Trump began streamlining the NSC staff in 2017.