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Note highlight in third paragraph, this happened under obama's watch, not Pres Trump.

Shocking Report Details How CIA Hubris Exposed Agents In China, Resulting In 30 Executions

"A bombshell new report in Foreign Policy  reveals that  up to 30 CIA agents and assets working in China were identified and executed by Chinese counterintelligence over a two year period after the CIA's encrypted communications system was infiltrated. 

The report is based on  former and current unnamed CIA officials  who were part of the program, which established a network of spies across China. The in-country spies communicated with their CIA handlers via an online system capable of being logged into from any laptop or computer. 

But when starting in late 2010 Chinese authorities began to sweep up the network of spies for interrogation and eventual execution,  the CIA was  "shellshocked"  in the words of one former official, and for eight years a joint FBI-NSA-CIA investigation has sought answers as to what went wrong in what is widely considered  "one of the CIA’s worst failures in decades".

https://www.zerohedge.com/news/2018-08-16/shocking-report-details-how-cia-hubris-exposed-agents-china-resulting-30-executions