"I also believe that we need a credible, open, transparent international investigation led by the World Health Organization," Jake Sullivan told CBS' Face the Nation show.

"And they're about to come out with a report about the origins of the pandemic in Wuhan, China, that we have questions about, because we do not believe that China has made available sufficient original data into how this pandemic began to spread both in China and then eventually around the world.," he said.

"And we believe that both the WHO and China should step up on this matter,"he said.

Asking the World Health Organization to perform the task properly,  he said: "I'm not in a position to say how COVID-19 came into this world. All I'm in a position to do is to call upon the WHO to do its job to the fullest extent possible."