President Donald Trump escalated his campaign for U.S. control of Greenland on Friday, floating the idea of using tariffs as economic leverage against countries that refuse to support the move.

Tariffs as Geopolitical Leverage

Speaking at a White House event ostensibly about rural health care, Trump suggested tariffs could become his tool of choice for advancing U.S. interests in the Arctic. The island, he argued, is essential to American national security, according to the Associated Press.

"I may do that for Greenland too," Trump said, referencing earlier threats to slap tariffs on European pharmaceuticals. "I may put a tariff on countries if they don't go along with Greenland, because we need Greenland for national security."

Trump has spent months making the case that U.S. control of Greenland is necessary. Earlier this week, he declared that anything short of American control would be "unacceptable." The problem? Greenland is a semi-autonomous territory of Denmark, which happens to be a NATO ally.

European Leaders Push Back Hard

European officials wasted no time rejecting the pressure campaign. The message was clear: decisions about Greenland's future belong to Denmark and Greenland, not Washington.

Greenland Prime Minister Jens-Frederik Nielsen didn't mince words during a joint press conference with Danish Prime Minister Mette Frederiksen. "We are now facing a geopolitical crisis, and if we have to choose between the U.S. and Denmark here and now, we choose Denmark," Nielsen said.

Denmark announced plans to increase its military presence in Greenland in coordination with allies. French President Emmanuel Macron added fuel to the response, pledging French troops to participate in "Operation Arctic Endurance," a Danish-led military exercise in the region.

Diplomatic Talks Produce More Confusion Than Clarity

Earlier this week, foreign ministers from Denmark and Greenland traveled to Washington for meetings with Vice President JD Vance and Secretary of State Marco Rubio. The talks resulted in an agreement to establish a working group, but that's where the consensus ended.

Danish officials and the White House later offered sharply different descriptions of what the working group is actually supposed to do, highlighting the diplomatic gulf between the two sides.

Prediction Markets Bet on Partial U.S. Control

On Kalshi, a U.S.-regulated prediction platform, traders are actively betting on whether the United States will gain control over any part of Greenland. The market currently prices in a 43% probability that America will assume control over at least some portion of the Arctic territory.

That's a substantial probability for what would be a major geopolitical shift, especially given the firm resistance from both Denmark and Greenland. The question now is whether Trump's tariff threats will remain rhetoric or evolve into actual economic pressure, and whether prediction markets are pricing in genuine geopolitical analysis or simply Trump's track record of unpredictability.