Trump tweets won’t cut it.

If President Donald Trump really wants to bring the House Freedom Caucus to heel, he probably will have to escalate his attacks on it. Tweets about the group of 30 or so of the most conservative Republicans in the House won’t do it. He will have to name individual members and recruit strong primary challengers against them — and not just threaten to do it.

And while we often hear that the Republican Party now belongs to Trump, primary challengers hoping to defeat conservative congressmen will have three problems that Trump didn’t face during his run for president. They are unlikely to be as famous as Trump, they probably won’t command the media attention he did, and they will be running against established incumbents. Last year, candidates attempting to run as mini-Trumps took on two conservative incumbents — House Speaker Paul Ryan and Sen. Marco Rubio — and lost badly.

You can see why Trump would want more loyal allies in Congress. My National Review colleague Rich Lowry writes that “Trumpism is in crisis,” because there is no Trumpist cadre in Congress. The Freedom Caucus generally is animated by a vision of limited government to which Trump is at best indifferent.

Trumpism has a deeper problem, though, which is that it doesn’t, well, exist.

You can piece together a coherent and distinctive political program, maybe even a political philosophy, from some of Trump’s most deeply held positions and from the interests and views of his most dedicated fans. The components would include restrictions on trade and immigration, a foreign policy based frankly on a narrow conception of American interests, a moderate social conservatism, and support for activist government when it helps working-class voters.

Trumpism so defined surely would appeal to a lot of Republican voters, and probably to a lot of non-Republicans, too. But it would leave a lot of other Republican voters cold.

It’s not even the worldview of many of Trump’s executive-branch appointees.

And it’s not clear that Trump is a Trumpist himself. If he were, he probably would not be criticizing the Freedom Caucus for refusing to support Ryan’s health care bill. He would be criticizing the bill because it would cause many workingclass voters to lose their health insurance.

Trump is emphasizing points of agreement between conservatism and Trumpism, such as immigration control.

But attacking your coalition partners over Twitter probably would not be a major component of any rational Trumpist strategy.