US President Donald Trump says he has instructed his administration to halt funding to the World Health Organization (WHO).
He said the WHO had “failed in its basic duty” in its response to the coronavirus outbreak.
He accused the UN body of mismanaging and covering up the spread of the virus after it emerged in China, and said it must be held accountable.
Mr. Trump has previously accused the WHO of being biased towards China.
The US president has himself come under criticism at home over his handling of the outbreak.
“I am directing my administration to halt funding while a review is conducted to assess the World Health Organization’s role in severely mismanaging and covering up the spread of the coronavirus,” MR. Trump told a news conference at the White House.
“The WHO failed in its basic duty and it must be held accountable,” he added.
Reacting to Mr Trump’s remarks, UN Secretary-General António Guterres said now was “not the time” to be cutting resources for the WHO.
The US is the WHO’s biggest single funder, providing $400m (£316m) last year – just under 15% of its total budget.
China’s contribution in 2018-19 was almost $76m in assessed contributions and about $10m in voluntary funding, according to the WHO website.
The organisation launched an appeal in March for $675m to help fight the pandemic and is reported to be planning a fresh appeal for at least $1bn.
“With the outbreak of the Covid-19 pandemic, we have deep concerns whether America’s generosity has been put to the best use possible,” the president said.
The US is the worst-affected country in the coronavirus pandemic with 608,377 cases and 25,981 deaths.
President Trump accused the WHO of having failed to adequately assess the outbreak when it first emerged in the city of Wuhan.
“Had the WHO done its job to get medical experts into China to objectively assess the situation on the ground and to call out China’s lack of transparency, the outbreak could have been contained at its source with very little death,” he told reporters.
“This would have saved thousands of lives and avoided worldwide economic damage. Instead, the WHO willingly took China’s assurances to face value… and defended the actions of the Chinese government.”
White House reporters pointed out, however, that MR. Trump himself praised China’s response to the outbreak and downplayed the danger of the virus at home.
Speaking in the Rose Garden at the White House, President Trump also said that plans to reopen the country were “close to being finalised”.
Mr. Trump caused a furore on Monday when he said that he, and not state governors, had the authority to lift lockdowns and restart the economy.
But on Tuesday, he changed his position, saying: “The governors are responsible. They have to take charge.”
“The federal government will be watching them closely. We will hold governors accountable, but will be working with them to make sure it goes really well.”
Experts agree it is the governors who are responsible for policing their states under US law.
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