China's desire to dominate new wireless technology poses a global threat that should be thwarted by a new, secure network, according to a former Trump administration official whose call for an enlarged U.S. government role caused an uproar last year.

China will gain a capability for mayhem and mass surveillance if it dominates advanced 5G networks that link billions of devices, retired Air Force Brig. Gen. Robert Spalding said in a memo that was obtained by Bloomberg News.

"The more connected we are, and 5G will make us the most connected by far, the more vulnerable we become," Spalding, who left the National Security Council last year, said in the memo.