Former Treasury Secretary Larry Summers had strong words for President Donald Trump's administration on Sunday, warning that the White House could be squandering one of its most valuable assets.

"I think that making policy based on facts, advancing issues based on analysis, is central to the effective functioning of government. And so I'm very concerned by the repeated tendency to engage in alternative facts and to assert things that are not supported by reality," Summers told CNBC from the China Development Forum in Beijing.