The tape showed that Nixon had agreed that administration officials should approach the Director of the CIA and ask him to request that the Director of the FBI halt the Bureau's investigation into the Watergate break-in on the grounds that the Watergate break-in was a National Security matter. In so agreeing, Nixon had entered into a criminal conspiracy whose goal was the obstruction of justice — a felony, and an impeachable offense.
Listen to the tape - and read the transcript at