What was the start date for the party of LSAP with a Prime Minister of Jean-Claude Juncker?
CREATE TABLE "list_of_ministers_for_the_police_force" (
  "minister" text,
  "party" text,
  "start_date" text,
  "end_date" text,
  "prime_minister" text
);
SELECT "start_date" FROM "list_of_ministers_for_the_police_force" WHERE "party"='lsap' AND "prime_minister"='jean-claude juncker';