The Danish PM's tour of three capitals betrayed the nervousness felt in Denmark over Trump's repeated comments.

Frederiksen was meeting on Tuesday with European leaders including German Chancellor Olaf Scholz, French President Emmanuel Macron and NATO Secretary General Mark Rutte.

Frederiksen didn't directly mention Trump's threat in comments at a meeting with German Chancellor Olaf Scholz, but said that “we are facing a more uncertain reality, a reality that calls for an even more united Europe and for more cooperation.

During last week's tense call with the Danish premier, Trump insisted he was serious about taking over Greenland, the Financial Times reported, raising fears about the future of trans-Atlantic relations.

Interest in buying Greenland has "popped up from time to time in American politics," Tom Høyem, Denmark's former minister to Greenland, told ABC News in an interview.

Faced with increasing pressure from President Donald Trump to hand over the strategically important island of Greenland to the U.S., Denmark has announced plans to beef up its military presence there.

Danish Prime Minister Mette Frederiksen sought to drum up support from European allies to stand up to Donald Trump’s efforts to appropriate Greenland, as she tried to project unity while avoiding antagonizing the US president.

I think I’m not allowed to run again.” Turning to Johnson, a former constitutional lawyer Following President Donald Trump's return to office, immigration enforcement operations have started to sweep through major U.