Boxing promoter Don King is praising Donald Trump as "the only gladiator" who can take on a system that King said is "rigged" and "racist" and "sexist."
King introduced the Republican presidential nominee to a group of pastors in Cleveland on Wednesday.
King said white women and African-Americans should vote for Trump to topple the established order.
He wore a bejeweled denim jacket and held American and Israeli national flags.
King has long supported his friend Trump, but the appearance Wednesday marks his highest-profile appearance on the Republican nominee's behalf. King wanted to speak at the Republican National Convention in July. But GOP officials kept him off the stage, in part to avoid a focus on his manslaughter conviction in the 1960s.
The event Wednesday was hosted by New Spirit Revival Center pastor and Trump supporter Dr. Darrell Scott.