US President Donald Trump is exploring various options to acquire Greenland, which may include military action, according to the White House. The White House informed the BBC that gaining control of Greenland, a semi-autonomous territory of Denmark, a fellow NATO member, is a "national security priority." This announcement followed a joint statement from European leaders supporting Denmark, which has been resisting Trump's interest in the Arctic island. Over the weekend, Trump reiterated that the US "needed" Greenland for security reasons. In response, Danish Prime Minister Mette Frederiksen warned that any US attack would threaten NATO's existence. On Tuesday, the White House stated: "The president and his team are discussing a range of options to pursue this important foreign policy goal, and of course, utilizing the US military is always an option at the Commander-in-Chief’s disposal." NATO is a military alliance where members are expected to assist each other if attacked. On the same day, six European allies expressed their support for Denmark in a joint statement. The leaders of the UK, France, Germany, Italy, Poland, Spain, and Denmark declared, "Greenland belongs to its people, and only Denmark and Greenland can decide on matters concerning their relations." They emphasized that, like the US, they are committed to Arctic security, which should be achieved collectively by NATO allies, including the US.