"Instead of unifying the country to accelerate our public health response and get economic relief to those who need it, President Trump is reverting to a familiar strategy of deflecting blame and dividing Americans".
"That's the kind of stuff where you begin to get anxious that basic - not just institutional norms - but our basic understanding of rule of law is at risk", he said.
Flynn was one of the first and highest-ranking Trump aides to plead guilty and cooperate with Mueller's investigation, as the FBI tried to determine whether anyone in Trump's campaign had coordinated with Russian Federation.
Former President Barack Obama described President Donald Trump's handling of the coronavirus pandemic as "chaotic" in a conference call with former members of his administration, a source said on Saturday. "What we're fighting against is these long term trends where being selfish, being tribal, being divided and seeing others as an enemy".
At the end of March, Trump eased fuel economy rules set by the previous administration, with Obama tweeting, "We can't afford any more consequences of climate denial", in response.
During the call, Obama said his Republican successor's approach to government was partly to blame for the USA response to coronavirus.
"This election that's coming up - on every level - is so important because what we're going to be battling is not just a particular individual or a political party", Obama, who endorsed Biden officially last month, said.
Mr Trump took aim at the Obama administration's handling of the swine flu pandemic in 2009.
The much more combative criticism of the Trump administration's handling of the public health crisis came only during the latter part of the conversation, in which Obama first slammed the Justice Department's decision Thursday to drop the criminal charges against Michael Flynn, Trump's first national security adviser who was sacked after the revelation of his lies to the Federal Bureau of Investigation (FBI) about his contacts with Russian Federation during Trump's presidential transition period.
Obama is expected to campaign heavily for his former vice president, which he confirmed on the call. "We all know Joe", Obama was quoted as saying by the NBC News report.
"And it's part of the reason why the response to this global crisis has been so anemic and spotty", he said. Obama even said "it has been an absolute chaotic disaster".
"I'm going to be spending as much time is necessary and campaigning as far as I can for Joe Biden".