The Koch brothers (specifically, Charles and David) are essentially hard-leaning libertarian slash Randian in outlook, and as such they tend against the installation of trade barriers, tariffs, military interventions that do not serve the security or commercial interests of the United States, et cetera. While it is common (and easy) to deride the Koch’s as being right wing boosters, it is oversimplifying to simply lump them in with the Tea Party and alt-right groups ideologically; the Koch’s have actually supported certain social justice and civil rights initiative, including opposing the PATRIOT Act, support for gay marriage and marijuana decriminalization, and criminal justice reform. They are actually one of the largest single contributors by dollar figure to the ACLU, and have long supported formalizing DACA in legislation and creating a path toward citizenship for undocumented immigrants. That they have also funded groups to suppress climate change research, have funded lobbyists to opening up oil and mineral reserves in ecologically sensitive protected areas, supported overturning Roe v. Wade and enacting anti-abortion policies, opposed the Affordable Care Act in favor of “free market” approaches to health care, and in general have funded political candidates on political far right such as Mike Pence is not really inconsistent with their principles in being fiscal conservatives and social libertarians with a pro-life bent.
BTW, tariffs, trade restrictions, and limitation of immigration are traditional Democratic stances, with the reversal having occurred over the last thirty years concamitant with the sliding of American politics from center-left in the early ‘Seventies to hard right by the late ‘Nineties. If anything, the Kochs’ actually seek a return to the prior era of a business self-managed economy (to the benefit of their commercial interests, naturally) and moderately progressive social progress (albeit not with respect to abortion) instead of the populism of the modern era which has infected both major parties to the diminishment of actual policy. I think American politics would be better off without the Kochs’ and other big money donors able to influence elections and control policy with their network of bought-and-paid-for candidates, but painting them with the brush of just being far-right conservatives is not accurate or useful.