John Hyten is a never Trumper.

The alleged incident took place at a dinner in October 2017 that Spletstoser attended with Gen. Hyten where they sat with the Trumps. “The president is an idiot,” Hyten reportedly told her. “He is just a businessman without a basic understanding of national security. Everything is a business transaction for him, and making money is winning to him, and the only thing that matters.”

Hyten can deny these accusations, but they do ring eerily similar to other quotes from high ranking government officials close to the Trump Administration, including former Chiefs of Staff John Kelly and Reince Priebus, as well as former National Security Adviser H.R. McMaster. Former Secretary of State Rex Tillerson also famously referred to Trump as a “dope”.

https://hillreporter.com/insider-says-trumps-joint-chiefs-vice-chair-called-him-an-idiot-74125

Another nice list for comparison:

https://www.vanityfair.com/news/2018/02/trump-staffers-who-call-trump-an-idiot