A bipartisan U.S. congressional delegation is headed to Copenhagen later this week to show unity with Denmark amid tensions over Greenland. Sen.

Greenland has been at the center of a debate as Trump and his supporters have said it is a key location for American security.

Trump administration officials are set to meet with Danish officials about Greenland on Wednesday, diplomatic sources tell CBS News.

Denmark has pledged to station a radar system in eastern Greenland, as well as five new inspection ships to replace the ageing Thetis-class vessels, a Poseidon-type patrol aircraft and four long-range MQ-9B Sea Guardian air drones.

NATO is talking about improved Arctic security, says the alliance's secretary general. Some of those talks reportedly involve a European troop presence in Greenland. It's a remarkable turnaround for an alliance that has until recently tried to ignore the region.