President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Tuesday hailed a "great and important" day after his first-ever appearance before the United Nations General Assembly in New York.

"A great and important day at the United Nations. Met with leaders of many nations who agree with much (or all) of what I stated in my speech!" Trump tweeted.

A great and important day at the United Nations.Met with leaders of many nations who agree with much (or all) of what I stated in my speech! — Donald J. Trump (@realDonaldTrump) September 20, 2017

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In his first speech before the Assembly, Trump condemned North Korea's nuclear threat against the U.S., saying that the U.S. would "totally destroy" North Korea if forced to defend itself or its allies.

Trump also referred to North Korean leader Kim Jong Un in the speech as "Rocket Man," a new nickname for the leader that Trump coined in a tweet earlier this week.

The president also took on Iran, calling a nuclear deal reached between Tehran and Washington an "embarrassment" to the U.S.