Denmark has urged the US to respect its "territorial integrity", after the wife of one of Donald Trump's top aides tweeted a map of Greenland in the colours of the American flag.

Katie Miller, who is married to the US president's deputy chief of staff, posted the altered image of the Danish autonomous territory on her X feed late on Saturday, alongside the word "SOON".

Danish ambassador to the US, Jesper Moeller Soerensen, reposted her message, with a "friendly reminder" of the close defence ties between the countries.

Trump has repeatedly raised the possibility of Greenland becoming an annexed part of the US, citing its strategic location and mineral wealth.

His government's move to appoint a special envoy to Greenland recently prompted anger in Denmark - a Nato ally that has traditionally enjoyed close relations with Washington.