New Delhi, May 28 -- Mary Trump, the estranged niece of US President Donald Trump, launched a scathing personal and political attack on her uncle at the Hay Festival in Wales, declaring he "has never evolved" and remains "incapable of forming close relationships."

Speaking during a session on her latest book, Who Could Ever Love You, Mary Trump, daughter of Donald Trump's older brother, Fred Trump Jr, said, she is now estranged from all members of the Trump family except her daughter. The new book continues her long-standing criticism of the president, building on her previous bestsellers Too Much and Never Enough and The Reckoning.

According to a report in The Guardian, Mary Trump recounted her brief stint ghostwriting her uncle's seco...