US President Donald Trump gets fires on Sunday at formal President Barack Obama, who criticizes at how the current administration has handled the coronavirus pandemic.

"Look, he was an incompetent president," Trump said of Obama, after returning to the White House by Marine One. "That's all I can say. Grossly incompetent."

In a tweet later, the Republican called the Obama administration "one of the most corrupt and incompetent in US history," claiming that Obama and his deputy, Joe Biden, are the reasons why he's in the White House.

The comments came a day after Obama, a Democrat, issued a thinly veiled criticism of the Trump administration's handling of the coronavirus pandemic.

"More than anything, this pandemic has fully, finally torn back the curtain on the idea that so many of the folks in charge know what they're doing," Obama said during a virtual commencement speech on Saturday. "A lot of them aren't even pretending to be in charge."

In a private call with supporters earlier this month, details of which were leaked to media outlets, Obama called the Trump administration's coronavirus response "an absolutely chaotic disaster."

"It's part of the reason why the response to this global crisis has been so anemic and spotty," Obama reportedly said. "It would have been bad even with the best of governments."

More than 1.48 million people in the United States have infected with the coronavirus, with at least 89,550 deaths, according to a tally from Johns Hopkins University on Sunday. Both numbers are far higher than those in any other country or region.