noun
a person who offers an argument in defense of something controversial: an enthusiastic apologist for fascism in the 1920s
Origin:
mid 17th century: from French apologiste, from Greek apologizesthai 'give an account' (see apologize)

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It might be that the justices of the Supreme Court in the US are the chief apologists, especially when a decision is closely split. Almost by definition [ho, ho] everything they consider is controversial.