An announcement Thursday that Michael Horowitz, inspector general for the Department of Justice, would lead a far-reaching probe into how officials at the Justice Department and the FBI handled an investigation into Hillary Clinton ‘s emails resurrected a controversy that many Democrats had blamed for the loss of their candidate in the presidential race. The year-long criminal investigation of Clinton’s private email network – and whether it compromised classified information from her tenure at the State Department – rankled Republicans and Democrats alike, both in the perfunctory way agents pursued it and the public way the FBI director closed it.