(FILES) In this file photo taken on September 29, 2019, former US President Barack Obama speaks during the "Bits & Pretzels" start-ups and founder congress in Munich, Germany. - Obama has launched a scathing attack on Donald Trump's handling of the coronavirus pandemic, calling it an "absolute chaotic disaster." In a leaked web call may 8, 2020 with former members of his administration, Obama also said the Justice Department's decision to drop charges against Michael Flynn, the former Trump national security adviser who pleaded guilty to lying to the FBI in the Russia probe, endangers the rule of law in the US. (Photo by Christof STACHE / AFP)