State-policy
He was Minister of the Environment in the State of Saarland (1985–1994) then a Member of the Landtag of Saarland until 1999. He has been President of the Union of European Federalists since 1997. Since 2004 he is member of the Advisory Council of the Committee for a Democratic UN.
1999 Leinen was also member of the municipal council of Püttlingen/Saar.
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