Trump is scripting his own defeat in November

President Trump isn’t afraid to make enemies. Since he took down the Bush and Clinton dynasties—and many other opponents—in his upstart bid for the presidency in 2016, he seems to think there’s no foe able to derail his crusade.

But other Republicans aren’t as slippery, and Trump is making enemies on their behalf that could doom his own party dearly in the November midterm elections. Trump recently took aim at the huge political operation built by Charles and David Koch, the libertarian billionaires who flood millions of dollars into Republican election efforts. The Kochs are strong free-trade supporters, and Trump chided them for opposing his tariffs and other protectionist measures. “Total joke,” Trump tweeted on July 31. “I don’t need their money or bad ideas. Their network is overrated.”

Trump may not need Koch money, but a lot of other Republicans do. The Kochs didn’t support Trump in the 2016 election, but they didn’t oppose him either. And their network of donor organizations, including Americans for Prosperity and Freedom Partners, spent nearly $250 million politicking for other candidates who support their agenda, almost all of them Republicans. That spending undoubtedly helped push some Republican Congressional candidates over the top in tight races, solidifying GOP control of Congress and allowing the Trump tax cuts and other legislation to get through.

Dependent on the Koch network

Republicans need more help in 2018 than they did in 2016—and the Kochs are signaling they’re not likely to support Trump bandwagoners who back trade protectionism, tough restrictions on legal immigration and increased deficit spending. The group recently indicated it wouldn’t back Republican Senate candidates in North Dakota, Indiana and Nevada, all of which political analyst Larry Sabato rates as toss-ups that could potentially swing control of the Senate to Democrats.

If Trump further antagonizes the Koch network, their lack of support could be decisive in November. “The Republican party has grown to be dependent on the Koch donor network for hundreds of millions of dollars in election support,” says Robert Maguire of the Center for Responsive Politics, a campaign-finance watchdog. “It’s hard to downplay the impact their pullback would have on Republicans’ ability to make the case for their candidates in one of the most important midterms in a generation.”

Republicans hold the House by 23 seats, and there’s a good chance they could lose that many, or more, in the midterms, allowing Democrats to take control of at least one chamber. The Senate is a tougher prize for the Dems, but controlling the House would be enough to block most Republican legislation, mount aggressive investigations into Trump controversies, and possibly vote to impeach Trump.