Coronavirus inaction: could leaders have blood on their hands?
Meanwhile, a resolution tabled by the European Union called for an "impartial, independent and comprehensive evaluation" of the global response to the pandemic, which has so far infected almost 4.8 million people and killed more than 317,000. On Monday, it appeared to have won consensus backing among the health body's 194 member states.
In a late-night tweet, Trump blamed the health agency for fumbling early responses to the outbreak and being too deferential to China, where the virus emerged and began spreading a year ago.
Authorities in Wuhan have come under fire for reprimanding and silencing doctors who raised the alarm about the virus late a year ago.
'We all have lessons to learn from the pandemic. Every country and every organization must examine its response and learn from its experience.
He added that the World Health Organization was committed to "transparency, accountability, and continuous improvement" and welcomed the proposal for an independent evaluation of the global response to Covid-19, including the WHO's coordinating role. "To be truly comprehensive, such an evaluation must encompass the entirety of the response by all actors, in good faith".
The president has turned the World Health Organization into a frequent target for criticism as the coronavirus pandemic ravages the USA, infecting more than 1.5 million people in the country and killing more than 90,000 as of Monday night.
Trump has repeatedly attacked World Health Organization, claiming that it helped China hide the extent of the coronavirus pandemic in its early stages.
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Earlier, Mr Trump called World Health Organization "puppet of China" and had "done a very sad job" in its handling of the coronavirus.
Australian health minister Gregory Hunt said the planned review could look at strengthening the WHO's mandate and powers of inspection, and also how to protect against "the global threat posed by wildlife and wet markets".
Chinese President Xi Jinping speaking via video link on Monday.
The head of the World Health Organisation (WHO) has said he will begin an independent evaluation of the United Nations health agency's response to the coronavirus pandemic "at the earliest appropriate moment".
The US has more than 1.5 million of the world's 4.8 million confirmed cases of coronavirus so far, with more than 90,000 deaths.
"China will provide 2 billion USA dollars over two years to help with COVID-19 response and with economic and social development in affected countries, especially developing countries", Xi said.
Xi called on the world to provide more material, technological and personnel support for African countries, saying that "helping them build capacity must be our top priority in COVID-19 response".
"We have seen some solidarity, but very little unity, in our response to Covid-19".
'The risk remains high and we have a long road to travel, ' Tedros added, saying preliminary tests in some countries showed that at most 20% of populations had contracted the disease but most places that less than 10 per cent.