It’s true that U.S. economic growth got a bump for two quarters last year, and Trumpists are still pretending to believe that we’ll have great growth for a decade. But at this point last year’s growth is looking like a brief and rapidly fading sugar high.

Meanwhile, the tax cut remains unpopular, partly because few people perceived personal benefits, partly because voters appear to be less concerned about paying too much than with the sense that the rich — the prime beneficiaries of the Trump cut — are paying too little.

Some leaders might see such disappointments as reasons to make a course correction. But this is Trump: When the going gets tough, he blames someone else. Everything would have been great, he insists, if the Fed hadn’t thwarted his plans.

There’s a good argument to be made that the Fed misjudged the economy’s strength, that it raised interest rates too fast and that the economy would be doing somewhat better if it hadn’t. In fact, it’s an argument I agree with.

But that’s not what Trump is saying. He wants the Fed to act as if we were still in a deep depression; he wants it both to cut rates and to resume the emergency policies it pursued — and he denounced — when we had more than twice as much unemployment as we do today. This would, he insists, turn the economy into the “rocket ship” he originally promised.

You don’t have to be a gold bug or even an inflation hawk to see these demands as deeply irresponsible. Indeed, they sound a lot like the “macroeconomic populism” that has repeatedly led to economic disaster in Latin America, with Venezuela the latest example.

Running the printing presses to fight a depression, as the Fed did after the financial crisis, is prudent and sensible; running them because you refuse to accept the reality that your policies aren’t delivering an economic miracle is different, and always ends badly.