The Trump administration is investigating the email records of dozens of current and former senior State Department officials who sent messages to then-Secretary of State Hillary Clinton’s private email, reviving a politically toxic matter that overshadowed the 2016 election, current and former officials said. As many as 130 officials have been contacted in recent weeks by State Department investigators — a list that includes senior officials who reported directly to Clinton as well as others in lower-level jobs whose emails were at some point relayed to her inbox, said current and former State Department officials. Those targeted were notified that...