Interesting to correlate Kerry's 1987 request with this piece of information:
The Bureau conducted probes in May and June of 1986 of Sen. John Kerry (D-Mass.), Sen. David Durenberger (R-Minn.) and Rep. Lee Hamilton (D-Ind.) to determine whether their opposition to Administration policies in the region was being assisted by intelligence agents of the Nicaraguan government.
[Ross Gelbspan, Break-Ins, Death Threats and the FBI: The Covert War Against the Central American Movement, Boston: South End Press, 1991, 193; footnote cites as source Boston Globe, March 24, 1988]