WASHINGTON, May 25 - The top Democrat on the Senate Intelligence Committee said today that John R. Bolton might have mishandled classified information by sharing with another State Department official details about a communication intercepted by the National Security Agency. The assertion, by Senator John D. Rockefeller IV of West Virginia, followed a two-week review of the issue by the committee's staff. Mr. Rockefeller outlined his findings in a three-page letter to the leaders of the Senate Foreign Relations Committee, on the same day that the full Senate is beginning debate on Mr. Bolton's nomination as ambassador to the United...