“I AM A Tariff Man,” Donald Trump tweeted last week. “When people or countries come in to raid the great wealth of our Nation, I want them to pay for the privilege of doing so. We are right now taking in $billions in Tariffs. Make America rich again.”

I’m sorry, Mr. President, but you got this wrong. Tariffs are paid by American consumers. About half the $200 billion worth of Chinese goods you’ve already put tariffs on come almost exclusively from China, which means American consumers are taking a hit this holiday season.

These tariffs function exactly like taxes. By imposing them, you have, in effect, raised taxes on most Americans. You have made Americans poorer.

Worse yet, they’re regressive. The middle class and poor pay a larger percentage of their incomes on these tariffs than do the rich.

I needn’t remind you that your Tax Cuts and Jobs Act, passed last year, slashed taxes on big corporations and the rich by about $150 billion annually. You claimed it would cause companies to invest more in America and thereby create more American jobs. They didn’t. See General Motors.

They spent most of their tax savings buying back their own shares of stock. This gave the stock market a steroidal boost. Not surprisingly, the boost was temporary. Last week, the stock market erased all its gains for 2018. Worse may be in store. The whole American economy is slowing.

Your tariffs could put us into a recession. The world’s other big economies are slowing, too. In 1930, Congressmen Reed Smoot and Willis Hawley championed isolationist tariffs that Herbert Hoover signed into law. They deepened the Great Depression.

Your economic advisers are trying to put the best possible face on all this, arguing that your tariffs are designed to improve your bargaining leverage with China.

But your recent U.S.-China trade deal is already unraveling. More accurately, the deal never happened. Your claims about Beijing, China, agreeing to buy more U.S. agriculture and natural gas weren’t backed up by your own administration or the Chinese government. Sort of like your “great” deal with Kim Jong-un.

Some of your advisers said your real aim isn’t about trade at all. It’s to get China to stop stealing American technology. This presumably was the reason behind last week’s arrest of the chief financial officer of Chinese tech giant Huawei Technologies. Hint: That arrest won’t make it any easier to reach an agreement with China.

I’m not sure why you’re so interested in helping American corporations protect their technology anyway. That technology doesn’t belong to the United States. It belongs to those corporations and their shareholders. They develop and share it all over the world.

Most of these corporations have been willing to share their technology with China in joint ventures with Chinese companies because that’s the price of entering the lucrative Chinese market. They still come away making lots of money.

Of course, they could make even more if the Chinese didn’t take the technology. So maybe, as with the tax cut, you just want to make big corporations richer.

But let me give you the benefit of the doubt. I’m going to assume your real concern is America’s national security and that this whole “Tariff Man” blunderbuss is designed to prevent China from racing ahead of us in technologies that are critical to national defense.

John Bolton, your national security adviser, has said the real issue is a question of power and the theft of intellectual property has a major impact on China’s economic capacity and therefore on its military capacity. Bolton advises you, right?

But if this is your real motive and, quite frankly, I can’t come up with another reasonable one, might I suggest a better way to protect national security?

You have the authority to stop foreign corporations from buying any American corporation whose technology is critical to national security. So why not prohibit American corporations that possess such critical technology from sharing it with China, even if that’s the price of gaining access to China’s lucrative market?

Bar them from entering into joint ventures with Chinese corporations, prevent them from teaming up with Chinese state-owned companies and demand that they guard their technology under penalty of law.

Sure, these American corporations would have to sacrifice some profits, but so what? Your job isn’t to make them more profitable. It’s to protect the United States. And isn’t this a better way to do so than to impose a hugely regressive tax on average Americans and risk a global recession?

Robert Reich’s latest book is “The Common Good” and his newest documentary is “Saving Capitalism.”