Donald Trump spent a noteworthy chunk of the transition period provoking controversy—and insulting NATO allies—with his proposals for expanding the U.S. Maybe most prominently, he has repeatedly discussed buying Greenland from Denmark,

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.

President Trump reportedly held a “fiery” call with Denmark’s Prime Minister Mette Frederiksen over the president’s insistence that U.S. control of Greenland is necessary for American national security.