Premise: The Quartet on the Middle East or Middle East Quartet , sometimes called the Diplomatic Quartet or Madrid Quartet or simply the Quartet , is a foursome of nations and international and supranational entities involved in mediating the Israeli -- Palestinian peace process . Tony Blair . In Northern Ireland , Blair was involved in the 1998 Good Friday Agreement .
Hypothesis: Tony Blair was involved in the Israeli-Palestinian peace process of the 1990s.
Label: NEUTRAL