President Donald Trump, whose administration is under increasing pressure and criticism for its response to the coronavirus outbreak, lashed out in a Twitter tirade Monday morning that came as global markets tumbled from coronavirus fallout and Joe Biden appeared to be surging toward the Democratic nomination.

Trump blasted the media, accusing it of colluding with Democrats in trying to "inflame the CoronaVirus situation." He accused the Democratic Party of trying to "smear" Sen. Bernie Sanders, who lost his front-runner status to Biden in a Super Tuesday rout. And the president attacked his predecessors: "The Obama/Biden Administration is the most corrupt Administration in the history of our Country."

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The Trump administration and the president himself are under fire for what has been called a sluggish and flawed response to the initial outbreak of the coronavirus.

Critical reports, including by The Atlantic, The Washington Post and NBC News, have painted a portrait of a White House in an enhanced state of chaos. Some members of the administration, according to reports, have been calling for a more robust response since the early days of the outbreak. Others, including Trump and his top economic advisor, Larry Kudlow, have sought to play down the severity of the outbreak.

Later Monday morning on Twitter, Trump lauded his administration's response to the disease, taking credit for saving "many lives" and complimenting the task force being led by Vice President Mike Pence.

He added in a follow up: "So much FAKE NEWS!"

The president had spent the weekend in Florida, and was he scheduled to remain there Monday morning to participate in a fundraiser and chat with supporters before returning to the White House in the afternoon.

CNBC reported that Trump will be presented with a "full menu" of economic options to respond to the virus after he gets back to the White House.

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The number of coronavirus cases in the United States ballooned to at least 564 over the weekend, while at least 22 people have died from it in the U.S., according to Johns Hopkins University's tally. Globally, more than 111,000 have been infected, and at least 3,890 have died.