In January 1987, the Kohl-Genscher government was returned to office, but the FDP and the Greens gained at the expense of the larger parties. Kohl's CDU and its Bavarian sister party, the CSU, slipped from 48.8% of the vote in 1983 to 44.3%. The SPD fell to 37%; long-time SPD chairman Brandt subsequently resigned in April 1987 and was succeeded by Hans-Jochen Vogel. The FDP's share rose from 7% to 9.1%, its best showing since 1980. The Greens' share rose to 8.3% from their 1983 share of 5.6%. Later in 1987, Kohl had a summit with the East German leader Erich Honecker. Unknown to Kohl, the meeting room had been bugged by the Stasi, and the Stasi tapes of the summit had Kohl saying to Honecker that he did not see any realistic chance of reunification in the foreseeable future.