President Donald Trump has posted what appear to be private text messages from the head of NATO and France's president to the U.S. President, shortly after Norway's leader confirmed a leaked exchange did show tense correspondence between the Republican and NATO leaders.

Trump will head to Davos, Switzerland, amid rising tensions with NATO allies over his Greenland acquisition plans and threatened tariffs on European nations.

WASHINGTON (TNND) — President Donald Trump agreed to a meeting about Greenland at the World Economic Forum in Davos, Switzerland, following a call with NATO Secretary General Mark Rutte.

The argument over Greenland has threatened to reignite a trade war with Europe and upend the NATO alliance that underpins Western security.

The US president says "we have to have" Greenland, as European Commission President Ursula von der Leyen says "tariffs are a mistake".

TIME spoke to legal experts about whether Trump could legally pull the U.S. out of NATO and the wider implications.

U.S. President Donald Trump has linked his aggressive stance on Greenland to last year’s decision not to award him the Nobel Peace Prize, texting Norway’s prime minister that he no longer feels “an obligation to think purely of Peace.

The European Union’s top official called into question Trump's trustworthiness, saying that he had agreed last year not to impose more tariffs on members of the bloc.

Sen. Mark Warner (D-VA) told Special Report on Monday that President Donald Trump's "obsession" with securing a Nobel Peace Prize is shaping his foreign policy decisions and putting NATO at risk. BRET BAIER,