For Trump and Koch, it represents the latest chapter in the on again, off again relationship between the two parties. The theme of the ads is simple: Trump can't win, and with Trump as the Republican nominee, President Joe Biden will be reelected. The ads have landed the Koch network squarely on Trump's list of enemies, literally. "Club for No Growth and Koch Brothers operations spending tens of millions of dollars to prop up Ron DeSantis while attacking President Trump," the July 17 memo claimed. But neither the Koch network nor the Club for Growth has endorsed a Republican primary candidate.

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Persons: Donald Trump, Charles Koch, Koch, Joe Biden, George Soros, Paul Ryans, Trump, Ron DeSantis, David Koch, Charles Organizations: Republican, Koch Industries, PAC, Prosperity, Trump, Republican Party, Florida Gov, Koch, Club, Growth Locations: Trump's