https://www.mccaininstitute.org/staff/lynn-forester-de-rothschild/
Nathaniel Rothschild (UK) was partners with McCain’s top advisor Richard Burt in a consulting firm called Diligence. Diligence (like Manafort) provided numerous services to and lobbied the US government on behalf of Oleg Deripaska, shady billionaire front man for Putin.
https://www.mccaininstitute.org/donors/
Open Society Foundations. (Soros)
The Harry and Florence Sloan Foundation.
Sloan was a California state financial chair for the Mitt Romney presidential campaign, 2012.[14] Sloan also serves as a trustee on the board of The McCain Institute. During the 2016 election cycle, Sloan initially supported Ohio Governor John Kasich until he dropped out and on August 9, 2016, Sloan announced his support for Democrat Hillary Clinton.