Obama was grossly incompetent president: Trump

United States President Donald Trump on Sunday called his predecessor Barak Obama a 'grossly incompetent president'.

Trump's reaction came after Obama on Saturday criticised the US authorities' response to the coronavirus outbreak.

"He (Obama) was an incompetent president. That's all I can say. Grossly incompetent," Trump told reporters at the White House on his arrival from Camp David.

Trump was responding to a question on the virtual commencement address by Obama a day earlier.

In his address to college graduates, Obama had said that the COVID-19 pandemic has exposed the American leadership.

"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 without naming officials.

"A lot of them aren't even pretending to be in charge," he added.

There was no immediate response from the office of the former US president on the remarks made by Trump.