President Donald Trump’s move to halt funding to the World Health Organization has been met with severe criticism at home and abroad, with the United Nations secretary-general saying “now is not the time” for such a drastic move while the coronavirus pandemic is gripping the globe.

Trump made the announcement Tuesday pending a review of the WHO’s response to the initial coronavirus outbreak in China. He claims the agency has been too close to Beijing and covered up for its mistakes.

Congressional Democrats are disputing the president’s authority to do this. Republican lawmakers are planning their own investigation, examining the early response by the WHO and the Chinese government.

“Now is a time for unity in the global battle to push the COVID-19 pandemic into reverse, not a time to cut the resources of the World Health Organization, which is spearheading and coordinating the global body’s efforts,” U.N. Secretary-General António Guterres said in a statement Tuesday.

China expressed “deep concern” about Trump’s announcement, its foreign ministry spokesman, Zhao Lijian, said at a news briefing.

“As the most authoritative and most professional organization, the World Health Organization has played an irreplaceable role in global public health crisis,” Zhao said. “The decision of the U.S. will undercut the ability of the WHO and damage the global cooperation of fighting the epidemic.”

The European Union’s foreign policy chief, Josep Borrell, tweeted similar misgivings.

Russian Deputy Foreign Minister Sergei Ryabkov slammed Trump’s move as “a very selfish approach.” He told the TASS news agency, “We urge the United States to abandon further attacks on the WHO and pursue a responsible line.”

And Moussa Faki Mahamat, the chairman of the African Union Commission, called the decision “deeply regrettable.”

It’s not just governments and international organizations that have lined up to express dismay at Trump’s move. Experts, entrepreneurs and others have also been quick to condemn the announcement.

Microsoft founder and philanthropist Bill Gates told his 50 million Twitter followers that halting the WHO’s funding was “as dangerous as it sounds.”

“Their work is slowing the spread of COVID-19 and if that work is stopped, no other organization can replace them,” Gates tweeted. “The world needs the WHO now more than ever.”

Dr. Amesh Adalja, a senior scholar with Johns Hopkins Center for Health Security, told Reuters, “The move sends the wrong message during the middle of a pandemic.” While the WHO has made mistakes in the past, he added, “it’s not the middle of a pandemic that you do this type of thing.”

And Richard Horton, editor-in-chief of the Lancet medical journal, described Trump’s move as “a crime against humanity.” He tweeted that “every scientist, every health worker, every citizen must resist and rebel against this appalling betrayal of global solidarity.”

A slew of other world leaders and senior officials lined up to express their dismay over what they said was Trump’s willingness to hamper the WHO just when the world needs it the most.

The U.S. is the world’s largest financial contributor to the organization, accounting for roughly 15 percent of its budget. Trump has said that amounts to some $500 million each year.

German Foreign Minister Heiko Maas said that ascribing blame “does not help” because “the virus knows no borders. We have to closely work together.”

New Zealand Prime Minister Jacinda Ardern said that “at time like this when we need to be sharing information and we need to have advice we can rely on, the WHO has provided that.”

Not everyone was quite so scathing. Australian Prime Minister Scott Morrison said he sympathized with some of Trump’s criticisms of the WHO, but nevertheless said now was not the time “to throw the baby out with the bathwater” and hobble the agency at a time of