“The donor class controlled the Republican Party — that is, until the rise of Trump. The Kochs see that being ripped away, thus the open contempt for the president and his movement,” said former White House chief strategist Stephen K. Bannon.

Trump’s critics, however, said the fissures within the Republican Party have only grown over the past year, and they called the split a sign of wider unease.

“The Kochs are rather appalled at what they’re seeing from Republicans who they helped elect in 2010, 2014 and 2016 — and who promised to be fiscally responsible and support free markets,” said conservative activist Erick Erickson, who has worked with Koch-affiliated groups and who will host a conservative summit this week in Austin that is partly sponsored by the Koch Institute.