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Foreign nationals are prohibited from contributing to Senate races, but, according to the Dallas Morning News, during the 2015–16 election season, Ukrainian-born oligarch Leonard “Len” Blavatnik, who has British-American dual citizenship, put a small fraction of his $ 20 billion fortune into GOP Senate races. McConnell, who took $ 2.5 million for his GOP Senate Leadership Fund from two of Blavatnik’s companies, was the leading recipient. Others included political action committees for Senator Marco Rubio, Senator Lindsey Graham, Ohio governor John Kasich, and Arizona senator John McCain.
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Craig Unger (House of Trump, House of Putin: The Untold Story of Donald Trump and the Russian Mafia)