"Hey, this message is for Donald Trump," Jackson said in a heated video statement
"Do not speak on my brother's name. I'm making you a promise, you will not be in the White House come November. You will not be reelected, I'm telling you now."
Earlier in the day, Trump spoke with the media from the Rose Garden and said he hoped George is looking down right now -- "This is a great thing that's happening for our country. It's a great day for him. It's a great day for everybody ... in terms of equality."
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