Donald Trump’s niece responded to comments that her uncle is “weird” and “creepy” by agreeing, and in a scathing comment, doubling down on the rebuke of the Republican presidential nominee. “By adding J.D. Vance to the Republican ticket, Donald has increased the level of creepy weirdness exponentially, and the Harris campaign and its allies are taking every opportunity to capitalize on it,” Mary Trump wrote in her newsletter. “And, like the most effective political attacks, it works in part because it’s true.” The “weird” commentary on Vance has snowballed in light of Vance’s history of making…