What caveat (warning) does Nixon give regarding his

cooperation with the investigation?

President Richard Nixon, after the Watergate Scandal, warned the investigator regarding the investigation.

Explanation:

President Nixon advised that the disclosure of the scandal will lead to national security operations or C. I. A. Eventually, the revelation of the White House links in the break-in at the Democratic National Committee offices in the Watergate complex and consequent covering made President Nixon resign to avoid impeachment in 1974.