President Donald Trump is on the verge of hitting America’s three biggest trading partners with sweeping tariffs, a far more aggressive use of his favorite economic weapon than anything he did during his first term.

The looming import taxes on Mexico, Canada and China will be a major test of Trump’s unorthodox use of tariffs, which he’s described as “the greatest thing ever invented.”

It’s an enormous gamble, arguably a bigger one than any economic policy Trump enacted during his four-plus years in the White House. And this strategy has the potential to upend the thing many voters care about the most: the economy and the cost of living.

But Trump’s tariffs pose a big risk: They could backfire, lifting already-high consumer prices at the grocery store, rocking the shaky stock market or killing jobs in a full-blown trade war.

“This may be the biggest own-goal yet,” Mary Lovely, senior fellow at the Peterson Institute for International Economics, told in a phone interview. “This is a huge gamble. It’s a recipe for slowing down the economy and increasing inflation.”

The Wall Street Journal went a step further, publishing a scathing op-ed on Saturday titled: “The Dumbest Trade War in History.”