Transcript for US accuses China of covering up severity of COVID-19
President trump is sharpening his criticism of China, after a U.S. Intelligence report showed. Here's Jonathan Karl. Reporter: To president trump, there is no doubt who is to blame for the coronavirus pandemic. It came from China. It should have been stopped. It could have been stopped on the spot. They chose not to do it, or something happened. Either there was incompetence or they didn't do it for some reason. And we're going to have to find out what that reason was. Reporter: The U.S. Is accusing China of covering up how devastating the virus was when it first hit. The report says the Chinese government intentionally concealed the severity of the virus while it stockpiled supplies. Mike Pompeo telling Martha Raddatz the government has seen evidence the virus came from this lab in Wuhan, China. And, Mr. Secretary, have you seen anything that gives you high confidence that it originated in that Wuhan lab? Martha, there's enormous evidence that that's where this began. I can tell you that there is a significant amount of evidence that this came from that laboratory in Wuhan. Reporter: But the administration has not made any evidence public. The director of national intelligence has said they're investigating whether it began through contact with infected animals, or it was the result of an accident in a laboratory in Wuhan. The Chinese government knows it's not just Donald Trump placing blame. The chnese minister of state security has said -- so high, the report says, China should be prepared for the possibility of war with the United States. Some bold words. But as you point out, the critique isn't just from the U.S. When it comes to China. The secretary of state telling Martha the U.S. Is going to hold China accountable. Reporter: The president said on Friday, he wants to find out what happened before making a decision on retaliation. Yesterday, the president was asked if new tariffs could be part of any retaliation, and he said we're all playing a very complicated game of chess or poker. It's unclear what he has in mind. Jon, thank you. Next tonight, eight human trials under way for a vaccine.
This transcript has been automatically generated and may not be 100% accurate.