GENEVA (AP) — Nations around the world reacted with alarm Wednesday after President Donald Trump announced a halt to the sizable funding the United States sends to the World Health Organization. Health experts warned the move could jeopardize global efforts to stop the coronavirus pandemic.

At a briefing in Washington, Trump said he was instructing his administration to halt funding for the WHO pending a review of its role “in severely mismanaging and covering up the spread of the coronavirus.” The United States is WHO’s largest single donor, contributing between $400 million and $500 million annually to the Geneva-based agency in recent years.

Trump has repeatedly labelled COVID-19 the “Chinese virus” and criticized the U.N. health agency for being too lenient on China, where the novel virus first emerged late last year.

Outside experts have questioned China’s reported infections and deaths from the virus, calling them way too low and unreliable. And an investigation by The Associated Press has found that s ix days of delays between when Chinese officials k new about the virus and when they warned the public allowed the pandemic to bloom into an enormous public health disaster.

The WHO has been particularly effusive in its praise for China, calling on other countries to emulate their approach and repeatedly praising their transparency.

But China only agreed to a proposed WHO-led mission to investigate the coronavirus outbreak after WHO’s chief Tedros Adhanom Ghebreyesus personally paid a visit to Chinese President Xi Jinping, a highly unusual move to secure a country visit during an outbreak.

The European Union on Wednesday said Trump has “no reason” to freeze WHO funding at this critical stage and called for measures to promote unity instead of division. EU foreign policy chief Josep Borrell said the 27-nation bloc “deeply” regrets the suspension of funds and added that the U.N. health agency is now “needed more than ever” to combat the pandemic.

Borrell said “only by joining forces can we overcome this crisis that knows no borders.”

Even though the EU and the U.S. have been traditional allies for decades, the EU has increasingly been critical of the Trump administration over the past years.

Worldwide, the pandemic has infected nearly 2 million people and killed over 127,000, according to a tally by Johns Hopkins University. The virus is spread by microscopic droplets expelled into the air or left on surfaces when people sneeze or cough.

Australian Prime Minister Scott Morrison said he sympathized with some of Trump’s criticisms of WHO and China but that Australia would continue to fund the U.N. health agency.

“We work closely with them so that we’re not going to throw the baby out with the bathwater here,” Morrison told Perth Radio 6PR. “But they’re also not immune from criticism.”

Germany’s foreign minister, Heiko Maas, pushed back at Trump’s announcement.

“Placing blame doesn’t help,” he wrote on Twitter. “The virus knows no borders. We must work closely against COVID-19. Strengthening the U.N., in particular the underfunded WHO, is a better investment, for example, to develop and distribute tests and vaccines.”

The Netherlands has also thrown its support behind the WHO. “Now is not the time to hold back funding. Once the pandemic is under control, lessons can be learned. For now, focus on overcoming this crisis,” Sigrid Kaag, minister for foreign trade and development cooperation, said on Twitter.

Devi Sridhar, chair of global public health at the University of Edinburgh, called Trump’s decision “extremely problematic,” noting that WHO is leading efforts to help developing countries fight the spread of COVID-19.

“This is the agency that’s looking out for other countries and leading efforts to stop the pandemic,” Sridhar said. “This is exactly the time when they need more funding, not less.”

Sridhar said Trump’s move was a short-sighted political decision that would likely have lasting consequences.

“Trump is angry, but his anger is being directed in a way that is going to ultimately hurt U.S. interests,” she said.

Sridhar and others said it was still unclear what the precise impact of Trump’s funding cuts might be, but that other health priorities funded by the U.S., like polio eradication, malaria and HIV, were likely to suffer.

In Beijing, Chinese foreign ministry spokesman Zhao Lijian says the country is “seriously concerned” about the U.S. government’s decision to suspend funding.

The WHO did not respond to repeated requests from The Associated Press for comment, but its Director-General Tedros Adhanom Ghebreyesus and other top WHO officials were expected to attend a news conference on the pandemic later Wednesday.

Some experts say WHO dallied in declaring a pandemic; it did so only on March 11, long after the surging outbreaks on multiple continents met the agency’s own definition for a global crisis.

“They were really behind the curve,” said Mark Woolhouse, professor of infectious disease epidemiology at the University of Edinburgh.

The U.N. health agency also insisted for months that the virus could be contained and was not as infectious as influenza. But many outbreak experts, including at the U.S. Centers for Disease Control and Prevention, say COVID-19 is spreading many times faster than flu and that its rate of spread was apparent in January.

Still, some global health academics said Trump’s attacks on WHO might actually strengthen the agency’s credibility.

“If Trump was making a great success of the pandemic response in the U.S., if there were minimal cases and deaths there, that might be different,” said Sophie Harman, a professor of international politics at Queen Mary University of London. “But things are getting worse and that reinforces the need for WHO.”

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Cheng reported from London.

Follow AP coverage of the pandemic at http://apnews.com/VirusOutbreak and https://apnews.com/UnderstandingtheOutbreak