CNN/In 2017, the Chinese government was offering to spend $100 million to build an ornate Chinese garden at the National Arboretum in Washington DC.
But when US counterintelligence officials began digging into the details, they found numerous red flags.
The canceled garden is part of a frenzy of counterintelligence activity by the FBI and other federal agencies focused on what career US security officials say has been a dramatic escalation of Chinese espionage on US soil over the past decade.
