Jake Sullivan, the national security adviser, said in an interview that “we’ve just stuck with our theory, which is managed competition.” Trump and Xi Jinping might have other plans.

As President-elect Donald Trump enters his second term Monday, he’s facing down an unprecedented foreign threat: Chinese hackers. In the last several years, three distinct Chinese hacking campaigns have occurred in the United States — even reportedly infiltrating U.

The Biden administration on Friday made one final push to expose what officials say is a rampant Chinese cyber-espionage campaign by identifying a company and a person allegedly behind a pair of damaging hacks aimed at senior US officials.