Here’s an official announcement from his twitter handle confirming the report
Tonight, @FLOTUS and I tested positive for COVID-19. We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!
Tonight, @FLOTUS and I tested positive for COVID-19. We will begin our quarantine and recovery process immediately. We will get through this TOGETHER!
— Donald J. Trump (@realDonaldTrump) October 2, 2020
His senior aide, Hope Hicks had earlier tested positive for the disease.