COPENHAGEN, Denmark (AP) — U.S. President Donald Trump suggested Friday that he may punish countries with tariffs if they don’t back the U.S. controlling Greenland, a message that came as a bipartisan Congressional delegation sought to lower tensions in the Danish capital.

Trump for months has insisted that the U.S. should control Greenland, a semiautonomous territory of NATO ally Denmark, and said earlier this week that anything less than the Arctic island being in U.S. hands would be “unacceptable.”

During an unrelated event at the White House about rural health care, he recounted Friday how he had threatened European allies with tariffs on pharmaceuticals.

“I may do that for Greenland too,” Trump said. “I may put a tariff on countries if they don’t go along with Greenland, because we need Greenland for national security. So I may do that,” he said.

He had not previously mentioned using tariffs to try to force the issue.

Earlier this week, the foreign ministers of Denmark and Greenland met in Washington this week with U.S. Vice President JD Vance and Secretary of State Marco Rubio.

That encounter didn’t resolve the deep differences, but did produce an agreement to set up a working group — on whose purpose Denmark and the White House then offered sharply diverging public views.

European leaders have insisted that is only for Denmark and Greenland to decide on matters concerning the territory, and Denmark said this week that it was increasing its military presence in Greenland in cooperation with allies.

A relationship that ‘we need to nurture’

In Copenhagen, a group of senators and members of the House of Representatives met Friday with Danish and Greenlandic lawmakers, and with leaders including Danish Prime Minister Mette Frederiksen.

Delegation leader Sen. Chris Coons, a Delaware Democrat, thanked the group’s hosts for “225 years of being a good and trusted ally and partner” and said that “we had a strong and robust dialog about how we extend that into the future.”