Parliamentary group leader
The leader or chairman of a parliamentary group holds an influential political post in a parliamentary system with strong party discipline. When a party is in opposition, or the minor or junior partner in a governing coalition, they are not often the political leader of the party and the primary spokesperson for the party, although this is also true of the governing party in some cases. When a parliamentary group gains the confidence of the legislature (that is, secures the most seats in the legislature), the leader of that group often becomes the Prime Minister or Premier.
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