Top telecom executives met with US national security officials Friday as concerns mount over a long-running Chinese cyber-espionage campaign that has targeted some of the most senior US political figures in the country.

Senator Mark Warner, the chairman of the Senate Intelligence Committee, told the Washington Post on Thursday the breach was "worst telecom hack in our nation's history - by far." The White House meeting was hosted by national security adviser Jake Sullivan and Anne Neuberger,

Beijing repeatedly denies claims by the US government and others that it has used hackers to break into foreign computer systems