Trump says he'll end the "inflation nightmare." Economists say Trumponomics could drive up prices.

Former President Donald Trump is campaigning on a pledge to end the "inflation nightmare," vowing that if he wins a second term, he'll bring down prices "very quickly." And if that scenario came to pass, it would be cheered by the millions of Americans who say higher costs remain a major problem.

There's only one problem: Key policies that undergird so-called Trumponomics — a combination of tariffs, tax cuts and a crackdown on immigration — are likely to cause a flare-up in inflation, according to many Wall Street economists. That would be a painful outcome for consumers and businesses sapped by more than two years of surging prices. More broadly, renewed inflationary pressures would also come as inflation is finally inching closer to the Federal Reserve's goal of 2% per year. 

But experts warn that Trump's economic policies could cause such progress to stall, and even reverse. They note that tariffs effectively act as a consumption tax, increasing the cost of goods imported into the U.S. — costs that businesses typically pass on to consumers.