WASHINGTON, Aug 20 (Reuters) - The U.S. Justice Department has requested to interview FBI officials who were involved in the 2022 search of Donald Trump's Mar-a-Lago resort in Florida as part of a wide-ranging probe examining past investigations of the president, four sources familiar with the matter said on Thursday. The requests came from investigators working with Joe diGenova, a Trump ally who began overseeing the Florida-based investigation earlier this year. The investigation has been seeking to establish that Trump was the victim of a criminal conspiracy against his rights.