President Donald Trump has suggested imposing tariffs on nations that do not support his Greenland agenda.

“I might impose tariffs on countries that don’t support our Greenland efforts because we require Greenland for national security,” Trump stated on Friday during an unrelated White House event. “So I might do that.”

Following the that resulted in the of the South American nation’s president, Nicolás Maduro, Trump has reiterated his ambition to annex Greenland, a self-governing territory within the Kingdom of Denmark. He has consistently asserted that the United States requires Greenland for “national security” purposes.

“Currently, Greenland is surrounded by Russian and Chinese vessels everywhere,” he told reporters on Air Force One earlier this month. “We require Greenland for national security reasons. And Denmark will not be capable of handling it.”

Although Trump has argued that the European Union also “needs” America to assume control of the territory, European leaders have vigorously opposed the notion. Seven leading continental figures defended Greenland’s sovereignty in a earlier this month, declaring that “only Denmark and Greenland have the authority to decide on issues concerning Denmark and Greenland.” That same week, Greenland’s Prime Minister Jens-Frederik Nielsen urged the United States to retreat.

“No more pressure. No more hints. No more annexation fantasies,” he wrote in a social media post.

“When the U.S. President speaks of ‘needing Greenland’ and links us to Venezuela and military action, it’s not merely incorrect, it’s deeply disrespectful,” he stated. “Our nation is not a subject of superpower discourse. We are a population. A territory. And a democracy. This demands respect. Particularly from close and loyal allies.”

American officials convened with Greenland and Denmark’s foreign ministers at the White House on Wednesday, but the discussions did not bridge their divisions, with Danish Foreign Minister Lars Løkke Rasmussen noting that a “fundamental disagreement” persists between Denmark and the U.S. regarding the territory’s future. Also Wednesday, Denmark declared it was on and around Greenland. Several European NATO partners, including Sweden and Germany, announced they would also send military staff to the territory.

The Trump Administration has suggested that military force remains a possibility in its campaign to obtain Greenland, with White House Press Secretary Karoline Leavitt stating earlier this month that “deploying the U.S. military is always an option available to the Commander-in-Chief.” Danish Prime Minister Mette Frederiksen has warned that an American assault on Greenland would signal NATO’s demise, though both nations are founding members. Meanwhile, experts have told TIME that seizing Greenland is unnecessary for Trump to accomplish his national security objectives—and argued that remaining in NATO is far more critical to U.S. national security.

Although Trump has not before threatened tariff penalties on countries opposing his Greenland plans, the President has frequently employed such measures in .