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.

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.

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.

Danish Prime Minister Mette Frederiksen sought to drum up support Tuesday from European leaders over US President Donald Trump's threats to take over Greenland, with visits to Berlin, Paris and Brussels.

Danish Prime Minister Mette Frederiksen on Tuesday said she had received support from European leaders as she sought backing to counter U.S. President Donald Trump's threats to take over Greenland. After an initial stopover in Berlin in the morning,

Danish Prime Minister Mette Frederiksen embarked on a tour of major European capitals to gather support in the spat over Greenland, just as her nation earmarked funds for defending the Arctic island.

Denmark's prime minister embarked on a tour of major European capitals as the continent faces what she called “a more uncertain reality” and her country moves to strengthen its military presence around Greenland.

The Prime Minister of Denmark, Mette Frederiksen, is appealing to her European allies for help in dealing with US President Donald Trump's demands to appropriate Greenland, Bloomberg reports. Frederiksen is touring major capitals after a $2 billion investment in the defense of the Arctic island,