Donald Trump said he would deploy a hospital ship to Greenland, alleging that many people there are sick and not receiving care, even though both of the U.S. Navy’s hospital ships are currently docked at a shipyard in Alabama.

Trump’s announcement prompted a defense on Sunday of Denmark and Greenland’s health care system from their leaders, and it was the latest point of friction with the American leader who has frequently talked about seizing the massive Arctic territory.

“It’s a no thank you from here,” said Greenlandic Prime Minister Jens-Frederik Nielsen.

Trump’s social media post about a hospital ship came after Denmark’s military said its arctic command forces on Saturday evacuated a crew member of a U.S. submarine off the coast of Greenland for urgent medical treatment.