(FILES) In this file photo taken on April 23, 2019 former US Secretary of State Hillary Clinton speaks during the Time 100 Summit event in New York. - Donald Trump's administration is amping up an investigation into Hillary Clinton's emails, The Washington Post reported September 28, 2019, breathing new life into a pet issue used by the president to rail against his opponent during the 2016 elections. The question of whether Clinton improperly used a private email account and server while secretary of state led to Trump's repeat assertion that she deserved to be put in prison and frequent chants of "lock her up" at his political rallies. (Photo by Don Emmert / AFP)