But he declined to describe the evidence, ratcheting up tensions with Beijing over the origins of the deadly disease.
Trump did not mince words at a White House event on Thursday, when asked if he had seen evidence that gave him a "high degree of confidence" the virus came from the Wuhan Institute of Virology.
"Yes, yes I have," he said, declining to give specifics. "I can't tell you that. I'm not allowed to tell you that."
The Chinese state-backed Wuhan Institute of Virology has dismissed the allegations, and other US officials have downplayed their likelihood. Most experts believe the virus originated in a market selling wildlife in Wuhan and jumped from animals to people.
The Republican president has shown increasing frustration with China in recent weeks over the pandemic, which has cost tens of thousands of lives in the United States alone, sparked an economic contraction and threatened his chances of re-election in November.
Trump said previously his administration was trying to determine whether the coronavirus emanated from the Wuhan lab, following media reports it may have been artificially synthesized at a China state-backed laboratory or perhaps escaped from such a facility.
The coronavirus outbreak has contributed to a deepening rift between the Trump administration and China, with Beijing suggesting the US military might have brought the coronavirus to China and Trump saying China failed to alert the world to coronavirus risks in a timely and transparent fashion.
Trump also said on Thursday it was possible that China either could not stop the spread of the coronavirus or let it spread. He declined to say whether he held Chinese President Xi Jinping responsible for what he feels is misinformation about the emergence of the coronavirus.
Trump said of China's efforts to get to the bottom of how the virus emerged: "At least they seem to be trying to be somewhat transparent with us."
"But we're going to find out. You'll be learning in the not-too-distant future. But it's a terrible thing that happened - whether they made a mistake or whether it started off as a mistake and then they made another one. Or did somebody do something on purpose?" he said.
Trump told Reuters in an interview on Wednesday that he was looking at different options in terms of consequences for Beijing over the virus. "I can do a lot," he said.
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If this is correct (and given the strength of the US intelligence service, there is little reason to doubt it) then China need to be held fully accountable.
1) They need to issue a full and complete apology to every nation affected by their virus.
2) They should welcome UN Officials into China to inspect (and if required, dismantle) the bio labs in Wuhan
3) The need to pay reparations to every country that has suffered economic damage. And compensation to the families of those who have lost their lives due to the virus.
ODT contributor Robert Patman, also needs to add his voice of condemnation of China's actions....Appeasement didn't prevent the second world war, it certainly won't work with China!
I agree with Snozzman, tho i dont hold much hope for his third wish.
The pedant in me has a further worry - over terminology. The headline, supported by the first par, claims "Trump is confident virus may have started in Chinese lab". This may echo Trump's words, which would not be surprising. But, the trained journos at the ODT should hav asked themselves: How can he be CONFIDENT that something MAY hav happened? Either he CAN or CANNOT be confident it DID happen.