Democrats on Capitol Hill slammed and mocked President Trump`s letter to Norwegian Prime Minister Jonas Gahr Støre, in which the president elaborated on his motives for acquiring Greenland.

In the letter shared with multiple European ambassadors, Trump questioned why Denmark has a "right of ownership" over the semi-sovereign territory. He also cited the Norwegian Nobel Committee not awarding him the Nobel Peace Prize last year as why he is not interested in peace above all else.

"Dear Jonas: Considering your Country decided not to give me the Nobel Peace Prize for having stopped 8 Wars PLUS, I no longer feel an obligation to think purely of Peace, although it will always be predominant, but can now think about what is good and proper for the United States of America," Trump wrote, according to NewsNation, The Hill`s partner network.

Democratic Sen. Chris Murphy (Conn.), who is on the Foreign Relations Committee, wrote on the social platform X on Monday that "these are the ramblings of a man who has lost touch with reality."

"He isn`t ok," Murphy added. "He`s degraded significantly in the last year and he`s about to get us into a war with our allies."

Støre, in a statement to Bloomberg, clarified that Norway`s government does not award the Nobel prizes.

"Regarding the Nobel Peace Prize, I have several times clearly explained to Trump what is well known, namely that it is an independent Nobel Committee, and not the Norwegian government, that awards the prize," Støre said.

Sen. Ruben Gallego (D-Ariz.) wrote on X on Monday that the U.S. is "now the enemy of the free world because a pathetic man got his feelings hurt." His colleague, Sen. Andy Kim (D-N.J.), called the president "unhinged and embarrassing, but also incredibly dangerous" for writing the letter.

"Trump is doing lasting damage to our global position, which will harm our ability to keep America safe, secure, and prosperous," Kim added on X on Monday.

The president has argued Greenland is essential for national security and said in the letter that Denmark "cannot protect that land from Russia or China." Trump also claimed he has "done more for NATO than any other person since its founding, and now, NATO should do something" for the U.S.

"The World is not secure unless we have Complete and Total Control of Greenland," he added.

Sen. Brian Schatz (D-Hawaii) expressed concern over the president`s state, saying Monday on X, "I don`t see how you can be a serious person and not find this extremely worrisome." He also referenced that Trump, the oldest president to take the oath of office, turns 80 in June.

"He is not stable at all and his reality is warped," the Hawaii Democrat added.

Former GOP Rep. Adam Kinzinger (Ill.), a sharp critic of Trump, struck a similar tone, writing on X on Monday, "Guys. Republicans. It`s time to move Gramps into a home."

"[Let] adults govern again," he said.

Rep. Seth Moulton (D-Mass.), meanwhile, compared Trump`s rhetoric to that of a kid, writing Monday on X, "To my Republican colleagues: this is what happens when you don`t discipline a child."