Donald Trump’s mental decline is evident in his inability to “read the room” during public appearances, according to the 80-year-old’s niece. Jong-Fast asked her guest whether the president has lost the ability to “not say the quiet part out loud” as he gets older. Mary Trump (L) is the niece of the president through his brother, Fred Trump Jr. YouTube/Fast Politics“I think that Donald did have the ability to read the room better,” she replied. What that means is he’s losing impulse control, and that’s a part of his overall cognitive decline,” she added. The only people laughing at Donald Trump’s joke during his WHCA speech were seemingly members of his own administration.