Trump previews UN message: Body 'has not lived up to' its potential
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President TrumpDonald John TrumpComey responds to Trump with Mariah Carey gif: 'Why are you so obsessed with me?' Congress to get election security briefing next month amid Intel drama New York man accused of making death threats against Schumer, Schiff MORE argued Saturday that the United Nations (U.N.) has "tremendous potential" but has "not lived up to that potential," previewing his message ahead of the U.N. General Assembly next week.

Trump said in a video posted to Twitter that he looks forward to attending the gathering in New York, noting he would deliver a speech and the U.S. would participate in meetings, adding, "A lot of good things can happen."

"It's always been surprising to me that more things aren't resolved because you have all these countries getting together in one location, but it doesn't seem to get there," he said. "I think it will."

Trump is slated to speak Monday at an event about world drug issues and address the General Assembly at the official opening on Tuesday.

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The president will then lead a Security Council meeting on Wednesday focusing on Iran and broader efforts to limit nuclear proliferation, according to U.S. Ambassador to the U.N. Nikki HaleyNimrata (Nikki) HaleyNikki Haley hires Heritage Action chief to run her policy group Latest Bolton revelations are no game-changer Is Mike Pence preparing to resign, assume the presidency, or both? MORE.

Between Tuesday and Thursday, Trump is also set to meet with leaders from South Korea, Egypt, France, Israel, Japan and the United Kingdom.

Trump and his administration have been critical of the U.N. in the past, saying the organization is overly dependent on the U.S. while not being respectful enough to the country.

The president delivered a fiery speech at the General Assembly in New York last year, using the forum to emphasize his "America first" positions on a number of international issues.

During the speech he called the Obama-era Iran nuclear deal an “embarrassment” and threatened North Korea with total destruction if the country continued their pursuit of nuclear capability.