The World Health Organization said on Monday an independent review of the global coronavirus response would begin as soon as possible and it received backing and a hefty pledge of funds from China, in the spotlight as the origin of the pandemic.
Trump has repeatedly attacked World Health Organization, claiming that it helped China hide the extent of the coronavirus pandemic in its early stages.
Speaking at the WHA session, Ghebreyesus said, "The WHO is committed to transparency, accountability and continuous improvement..."
President Xi Jinping announced $2 billion donation to the United Nations and offered to set up hospitals and health infrastructure in Africa.
"Every country and every organisation must examine its response and learn from its experience", he said.
"After the research and development of China's coronavirus vaccine is completed and it is put into use, it will be made a global public good", said Xi, whose country now has five potential vaccines in clinical trials.
China will also provide $US2 billion ($3.09b) over two years towards helping with the COVID-19 response and Mr Xi promised any vaccine developed by his country would be made a global public good.
The assembly was set to discuss a resolution tabled by the European Union that calls for an "impartial, independent and comprehensive evaluation" of the global response to the coronavirus crisis.
Scientists around the world have been working on finding a cure for the virus that has ravaged the world, and one tweeted over the weekend that it could just go away naturally by the end of 2020.
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China has previously opposed calls for a review of the origin and spread of the coronavirus, but Xi signalled that Beijing would accept an impartial evaluation of the global response, once the pandemic is brought under control.
"This contagion exposes the fault lines, inequalities, injustices and contradictions of our modern world", Tedros said.
"Science has been hailed and scorned, nations have come together as never before and geopolitical divisions have been thrown into sharp relief", he said.
A formal proposal was submitted to the World Health Organization by Belize and Central American, Caribbean, and Pacific states that have maintained ties with Taipei, despite the Solomon Islands and Kiribati switching sides to Beijing a year ago.
"This is on top of a "tremendous amount" of medical supplies sent to over 50 African countries in recent months", he said.
"WHO had determined that the information provided by Taiwan held no value, and it neglected to respond", Taiwanese health minister Chen Shih-chung said last week.
Trump has steadily stepped up attacks on the WHO in recent months, often accusing the organization of being too close to Beijing and for dropping the ball on its response to the pandemic, freezing USA funding in April over the same allegations. "China has insisted on detecting, reporting, isolating and treating in time". In the following weeks, World Health Organization warned countries there was a narrowing "window of opportunity" to prevent the virus from spreading globally.
The organization also botched its initial response to the COVID-19 outbreak earlier in the year. It declared the outbreak to be a pandemic on March 11, after the virus had killed thousands globally and sparked large epidemics in South Korea, Italy, Iran and elsewhere.