caucus
noun [ C ]
uk/ˈkɔːkəs/ us POLITICS
a group of people with influence or an interest in something who meet to consider a particular issue or problem:
He added that his caucus would fight to restore the governor's health care plan.
MEETINGS
in the US, a meeting held to decide which person a political party will support in an election:
party/Democratic/Republican caucus The amendment would have eliminated the party caucus system for choosing candidates.