Koch said Trump's proposed temporary ban on Muslims entering the country is "antithetical to our approach," but he has a real problem with Trump's support of using a database to track Muslims in the country.
"That's reminiscent of Nazi Germany. I mean that's monstrous, as I said at the time," the Koch Industries CEO told ABC News.
Despite his strong feelings about Trump's stance, Koch said he and his brother David will still not "put a penny" toward the "Never Trump" movement to stop the real estate mogul from securing the Republican nomination, even though they have been asked to contribute. The Koch brothers have not spent money for or against any particular GOP candidate in the primary.
"That's not what we do," Koch said. "What we're trying to do is build alliances to make the country better. Like we have one with the White House on criminal justice reform. You do it by trying to find areas where you can work with everybody."
Editor's note: Donald Trump regularly incites political violence and is a serial liar, rampant xenophobe, racist, misogynist
How to vote
Vote-by-mail ballot request deadline: Varies by state
For the Nov 3 election: States are making it easier for citizens to vote absentee by mail this year due to the coronavirus. Each state has its own rules for mail-in absentee voting. Visit your state election office website to find out if you can vote by mail.Get more information
In-person early voting dates: Varies by state
Sometimes circumstances make it hard or impossible for you to vote on Election Day. But your state may let you vote during a designated early voting period. You don't need an excuse to vote early. Visit your state election office website to find out whether they offer early voting.My Election Office
General Election: Nov 3, 2020
Polling hours on Election Day: Varies by state/localityMy Polling Place