The Justice Department and F.B.I. investigation into whether the global antidoping authority and China covered up the positive tests of Chinese Olympic swimmers who went on to win medals at the past two Summer Games has continued under the Trump administration, according to a draft document obtained by The New York Times. The document, which the World Anti-Doping Agency plans to provide to its executive committee for a meeting this month, said that federal officials interviewed an employee of the agency who is an American citizen on Feb. 12 as part of the continuing investigation. The investigation began under the Biden administration after The Times and a German broadcaster revealed that 23 Chinese swimmers had tested positive for a banned substance ahead of the 2021 Olympics but that neither Chinese authorities nor WADA had disclosed the results or taken any action against the swimmers. In the final days of his first administration, President Trump signed into law a measure giving the U.S. authorities the power to pursue doping allegations across borders. The focus of the investigation, involving possible Chinese corruption and wrongdoing by an international organization, is among matters that Mr. Trump and his administration have signaled they are deeply interested in.