This alone.

sources:

"On 7/31/2019 Trump has a private meeting with Putin.

https://www.washingtonpost.com/world/2019/10/04/trump-has-spoken-privately-with-putin-least-times-heres-what-we-know-about-conversations/

On 8/3/2019, just 3 days after his private meeting with Putin, Trump issues a request for a list of top US spies.

https://www.thedailybeast.com/white-house-asks-for-list-of-top-intel-officials-amid-intelligence-shakeup

-By 2021 the CIA reports an unusually high number of their agents are being captured and/or being .murdered.

https://thehill.com/policy/national-security/575384-cia-admits-to-losing-dozens-of-informants-around-the-world-nyt/#:~:text=Leading%20counterintelligence%20officials%20issued%20a,were%20being%20captured%20and%20executed.

-During the search executed at Mar A Lago the FBI find more documents with lists of US informants on them.

https://www.cnn.com/2022/08/10/politics/mar-a-lago-search-informant-documents-donald-trump/index.html "