Mary Trump did not hesitate when asked why she believes her uncle, President Donald Trump, is in cognitive decline. In a searing interview on The Daily Beast Podcast, the daughter of Donald Trump’s late older brother, Fred Trump Jr., laid out the clearest case she’s ever made that the president is exhibiting the same signs she once saw in his father, Fred Trump Sr., who had Alzheimer’s “for a very, very long time.” The elder Trump was diagnosed with “mild senile dementia” in 1991. His physician