The massive Arctic island is mostly empty, but there are still plenty of reasons why the president would want to bring it under American control.

North Atlantic Treaty Organization Secretary General Mark Rutte demurred on Thursday when President Donald Trump baited him into backing his dream of the United States annexing Greenland. Rutte—who has been nicknamed NATO’s “Trump whisperer”—shared laughs with the president throughout their Oval Office meeting on Thursday.

Both Canada and Greenland, which is included in NATO as the territory of founding member Denmark, were raised during an informal press conference in the Oval Office. In the meeting, Trump also applied new pressure on the trans-Atlantic alliance to spend more on its collective defense.