But confirmation came soon after. In the letter addressed to Norwegian Prime Minister Jonas Gahr Store, Trump explained that he no longer feels obligated to focus exclusively on peace, while repeating his intent for US control over Greenland. In essence he lays out that no Nobel might turn into no Greenland for Europe (as Denmark exercises control over the resource-rich autonomous territory).

"Dear Jonas: Since your country decided not to give me the Nobel Peace Prize for stopping 8 wars PLUS, I no longer feel an obligation to think purely of peace, although it will always be dominant, but can now think about what is good and proper for the United States," the US President wrote.

Such is an example of kind of over the top and trolling-style rhetoric in the letter which has given people pause, questioning its authenticity. 

"Denmark cannot protect this land from Russia or China… The world is not secure unless we have complete and total control of Greenland," he added.

As for whether Trump indeed wrote it, and concerning the bombastic letter's authenticity, Forbes has noted that "According to PBS Newshour's Nick Schifrin, who first reported on the matter, the letter has been forwarded by the National Security Council staff to multiple European ambassadors in Washington."

The President also in the letter takes the opportunity to bash Denmark, saying it cannot protect Greenland from Russia or China, and again questioned its legal rights to Greenland: "There are no written documents; it's only that a boat landed there hundreds of years ago, but we had boats landing there, also."

Hours later, Norway issues a full, formal response:

Statement from Prime Minister Jonas Gahr Støre regarding communications with President Donald Trump.

"I can confirm that this is a text message that I received yesterday afternoon from President Trump. It came in response to a short text message from me to President Trump sent earlier on the same day, on behalf of myself and the President of Finland Alexander Stubb. In our message to Trump we conveyed our opposition to his announced tariff increases against Norway, Finland and select other countries. We pointed to the need to de-escalate and proposed a telephone conversation between Trump, Stubb and myself on the same day.