Starr's office was very pleased with the contents of Lewinsky's oral proffer and wanted to offer immunity but, for unspecified reasons, would not put the deal in writing.
Starr's office was very pleased with the contents of Lewinsky's oral proffer because it was explosive.
mnli hypothesis: Starr's office was very pleased with the contents of Lewinsky's oral proffer because it was explosive. premise: Starr's office was very pleased with the contents of Lewinsky's oral proffer and wanted to offer immunity but, for unspecified reasons, would not put the deal in writing.