World Health Organisation (WHO) officials yesterday denied it was "China-centric" and said the acute phase of a pandemic was not the time to cut funding, after US President Donald Trump said he may put contributions on hold.
The United States is the top donor to the Geneva-based body which Mr Trump said had issued bad advice during the coronavirus outbreak.
US contributions to WHO in 2019 exceeded $400m (€368m), almost double the second-largest country donor, according to figures from the US State Department. China contributed $44m, it said.
"We are still in the acute phase of a pandemic, so now is not the time to cut back on funding," Dr Hans Kluge, WHO regional director for Europe, told a virtual briefing when asked about Mr Trump's remarks.
Mr Trump told a news conference this week the United States was "going to put a hold on money spent to the WHO". However, he appeared to backtrack later when, in response to questions, he said: "We're going to look at it."
It was not immediately clear how Mr Trump could block funding for the organisation. Under US law, Congress, not the president, decides how federal funds are spent.
Dr Bruce Aylward, senior adviser to the WHO director-general, also defended the UN agency's relationship with China, saying its work with Beijing authorities was important to understand the outbreak which began in Wuhan in December.
"It was absolutely critical in the early part of this outbreak to have full access to everything possible, to get on the ground and work with the Chinese to understand this," he said.
"This is what we did with every other hard-hit country, like Spain, and had nothing to do with China specifically."
Dr Aylward, who led a WHO expert mission to China in February, defended WHO recommendations to keep borders open, saying China had worked "very hard" to identify and detect early cases and their contacts and ensure they did not travel.
"China worked very, very hard early on, once it understood what it was dealing with, to try and identify and detect all potential cases to make sure that they got tested to trace all the close contacts and make sure they were quarantined so they actually knew where the virus was, where the risk was," he said.
"Then they made it very clear that these people would not and could not travel within the country, let alone internationally," he added.
WHO director general Tedros Adhanom Ghebreyesus has been lavish in his praise of China from early in the outbreak, praising President Xi Jinping's "rare leadership".
David Heymann, a professor at the London School of Hygiene and Tropical Medicine who led WHO's response to the 2003 Sars outbreak, said that any US funding cut would be a huge blow.
"If the WHO loses its funding it cannot continue to do its work. It works on a shoe-string budget already," Prof Heymann said.
"Of course it would be disastrous for the WHO to lose funding."