A senior aide to US President Donald Trump, Stephen Miller, has intensified threats regarding the US taking control of Greenland, questioning Denmark's sovereignty over the territory. Miller stated that the US's formal position is that Greenland should be part of the US, citing national security concerns. In response, leaders from several European nations defended Greenland's sovereignty, emphasizing that decisions about the territory should be made by its people and Denmark. Danish and Greenlandic leaders criticized Trump's comments, with warnings about the implications for NATO.