Dr Jackson stresses that he hasn't personally reviewed Biden's medical records, but has witnessed the changes to the former vice president up-close, over time. "I saw him frequently around the West Wing and other places like that. I know he's always been prone to gaffes, but these aren't gaffes anymore. He can't form sentences. Sometimes, he can't complete a thought"
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Jackson's comments are available in Donald Trump Jr.'s upcoming book, "Liberal Privilege: Joe Biden and the Democrats' Defense of the Indefensible."