Why He Won’t Donate: “Not sure why anyone would give money to Mr. Trump since he asserts he is worth $10 billion.”

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Mike Fernandez

Who He Is: Florida health care investor, gave big to Jeb Bush

Why He Matters: One of the most prolific donors in a key swing state, has given more than $4 million to Republicans in recent elections

Why He Won’t Donate: He took out newspaper ads during the primaries comparing Mr. Trump to Hitler and Mussolini. He said he would donate to Mr. Trump “when hell freezes over,” adding, “Oh no, but is that not where he resides?”

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Sherry Herschend

Who She Is: Co-founder of Herschend Family Entertainment, a Missouri-based theme-park company, had been an enthusiastic supporter of Mike Huckabee

Why She Matters: Has given over $1 million to Republicans

Why She Won’t Donate: She said that Mr. Trump had degraded politics. “I’m just very disappointed in our whole country,” she said. “Our company is built on families, making people happy, and we just go down lower and lower every day.”