Trump at the UN / He shows his real face

UNITED NATIONS - In his first address to the United Nations, President Donald Trump on Tuesday called on the world to unite against rogue regimes like North Korea, derided its leader as "rocket man" and warned Kim Jong Un "is on a suicide mission."

"If the righteous many do not confront the wicked few, then evil will triumph," Trump said, as he detailed the horrors of the "depraved" North Korean regime.

"Rocket man is on a suicide mission," he said of North Korean leader Kim Jong Un, using a nickname that refers to Kim's recent missile tests.

Trump Tells United Nations: 'I Will Always Put America First' 1:29

While the U.S. could take military action itself, Trump urged the UN to join together in curtailing North Korea's nuclear efforts.

"We meet at a time of both immense promise and great peril," Trump said, calling it up to the nations gathered at the UN General Assembly whether the world grows to "new heights" or falls "into a valley of disrepair."

Trump's call to action hinged on a responsibility of the government to its citizens.

"As president of the United States, I will always put America first," he said, in a phrase reminiscent of one of his key presidential campaign slogans.

Trump urged other leaders to do likewise and always "put your countries first."

The president also took on Iran, dismissing the previously negotiated Iran nuclear deal between the U.S. and other key world powers to lift sanctions in exchange for Tehran curbing its nuclear program. Trump ripped the deal as an "embarrassment" and vowed this won't be the last that the world hears of this deal - "believe me."