Primary election season is almost done, and the midterm elections are just around the corner. Yet the Republican Party's most well-known megadonors are at odds with the Republican president.

In early 2018, the network of advocacy groups tied to billionaire industrialists Charles and David Koch pledged to spend close to $400 million on campaign contributions and policy initiatives in the lead-up to midterm elections. Since then, Charles Koch now leads the network after his brother David stepped down due to health reasons, and his already-rocky relationship with Trump has grown rougher.

Here's what's behind the feud between Charles Koch, the eighth richest person in the world, and President Donald Trump.





