Can Trump back up his boast that he’s worth $10 billion? Pulitzer Prize-winning investigative reporter and author David Cay Johnston, who has been covering Trump for decades, thinks not. Rather, he contends that the 45th president’s pocketbook will get exposed and that his true net-worth may prove to be substantially less. Want more breaking political news? Click for the latest headlines at Raw Story. ALSO READ: Trump’s spell is broken — no wonder he’s mad “Remember Donald used to tell us he was worth $10 billion,” he asked while appearing on Anderson Cooper’s CNN show “Anderson 360.” “He shou…