Pot and kettle springs to mind. The pot is allegations, the kettle is proven.

http://www.straitstimes.com/world/united-states/us-has-history-of-meddling-in-foreign-elections
http://thehill.com/blogs/blog-briefing-room/news/374372-ex-cia-director-us-meddles-in-foreign-elections-for-a-good
https://www.washingtonpost.com/news/worldviews/wp/2016/10/13/the-long-history-of-the-u-s-interfering-with-elections-elsewhere/?u