Secretary of State Mike Pompeo has demanded that China ‘come clean’ following reports that coronavirus originated in a Chinese laboratory, not as a bioweapon, but as part of bungling experiments to prove that Chinese scientists were superior to Americans in identifying emerging virus threats.

It comes after President Donald Trump said on Wednesday the U.S. is trying to determine whether the coronavirus first crossed to humans accidentally during experiments with bats at the Wuhan Institute of Virology Lab.

After word of the outbreak finally became public, Chinese leaders were quick to blame Wuhan’s ‘wet market’ where wild animals — though not bats — are sold for consumption, leading one source to tell Fox News the debacle is the ‘costliest government cover-up of all time.’

‘Patient zero’ worked at the Wuhan lab, and spread the virus into the local population after leaving work, sources who had been briefed on intelligence told the outlet.

‘What we do know is we know that this virus originated in Wuhan, China,’ Pompeo told Fox News on Wednesday evening. ‘We know there is the Wuhan Institute of Virology just a handful of miles away from where the wet market was. There is still lots to learn. The United States government is working diligently to figure it out.’

Asked about the new allegations at a White House press conference on Wednesday, Trump replied cryptically: ‘More and more, we’re hearing the story.’

‘We are doing a very thorough examination of this horrible situation that happened,’ Trump said.

Asked if he had raised the subject in his conversations with Chinese President Xi Jinping, Trump said: ‘I don’t want to discuss what I talked to him about the laboratory, I just don’t want to discuss, it’s inappropriate right now.’

Pompeo said in the interview that ‘one of the best ways they [China] could find to cooperate would be to let the world in and to let the world’s scientists know exactly how this came to be; exactly how this virus began to spread.’

[There were] a lot of cases [and] a lot of movement; a lot of travel around the world before the Chinese Communist Party came clean about what really transpired there,’ the secretary of state continued. ‘These are the kinds of things that open governments [and] democracies don’t do. It’s why there’s such risk associated with the absence of transparency. We need it still today.’

The Wuhan lab is China’s only bio-safety level four (BSL-4) facility, and has long been eyed with suspicion as scientists try to determine how the deadly virus crossed over into humans.

However, suspicion of the lab was quickly dismissed as a ‘conspiracy theory’ by some who insisted, like the Chinese leadership, that a wild animal market must have been the source.

Although the earliest confirmed case in Wuhan was a person who had no connection to the Huanan Wholesale Seafood Market, Chinese officials quickly pinned the blame on the market, a talking point that was eagerly repeated by the World Health Organization.

‘A large proportion of the initial cases in late December 2019 and early January 2020 had a direct link to the Huanan Wholesale Seafood Market in Wuhan City, where seafood, wild, and farmed animal species were sold,’ the WHO website says about the possible origins of the pandemic, while acknowledging the exact source of the outbreak has not been determined.

‘Many of the initial patients were either stall owners, market employees, or regular visitors to this market. Environmental samples taken from this market in December 2019 tested positive for SARS-CoV-2, further suggesting that the market in Wuhan City was the source of this outbreak or played a role in the initial amplification of the outbreak,’ the WHO says.

Though scientists say that genetic evidence indicates the virus was not artificially engineered, likely originated in bats, and probably crossed over to a human in a single event, there is nothing in the genetic data to indicate exactly where and how the virus first crossed to humans.

In early 2018, the U.S. Embassy in Beijing sent two official warnings back to Washington about inadequate safety at the Wuhan lab, including that it was conducting risky studies on pathogens in the coronavirus family in bats, the Washington Post reported Wednesday.

The cables warned about safety and management weaknesses at the lab and proposed more international assistance.

The Wuhan lab was originally set up with assistance from the French and American governments, but in recent years the Chinese have rebuffed international assistance there and tried to prove their ability to work independently.

After the coronavirus outbreak began, officials at the lab destroyed samples of the virus, erased early reports, and suppressed academic papers, sources told Fox News.

Officials at the Wuhan lab have previously dismissed any allegation that the virus emerged from the facility, calling them baseless conspiracy theories.

On Wednesday, it emerged that top Chinese officials waited six days to warn the public after becoming aware that a viral outbreak was causing a rash of deadly pneumonia cases in Wuhan.

In the meantime, residents in Wuhan hosted a mass banquet for tens of thousands of people, and millions began traveling for Lunar New Year celebrations.

By KEITH GRIFFITH FOR DAILYMAIL.COM and ASSOCIATED PRESS