By Brooke Singman

NEW YORK -- President Trump set the stage for a “big day” at the United Nations early Tuesday ahead of his first speech at the United Nations General Assembly.

"Big day at the United Nations –many good things, and some tricky ones, happening. We have a great team. Big speech at 10:00 A.M.,” the president tweeted early Tuesday, though he is actually scheduled to address the 72nd Session of the U.N. General Assembly at 10:30 a.m. ET.

The president is expected to touch on an array of issues affecting the international community, including North Korea’s nuclear program and possibly the 2015 Iran nuclear deal, in which Iran agreed to curtail its nuclear weapons program in exchange for the easing of economic sanctions.

Ahead of the address, State Department spokeswoman Heather Nauert told “Fox & Friends” on Tuesday that Trump will advance a “principled realism” on the U.N. stage, offering a “clear-eyed look at the world” that also promotes American values.

As candidate, Trump labeled the U.N. as weak and incompetent, and suggested that the body did not act as a friend of either the United States or Israel, but has since softened his tone. Trump recently praised a pair of unanimous U.N. Security Council votes to tighten sanctions on North Korea over its continued nuclear missile tests.

Over the weekend, the president tweeted about the rogue regime’s leader, Kim Jong Un, calling him “Rocket Man.” All eyes will be on Trump Tuesday for decisive leadership in the region.

“I spoke with President Moon of South Korea last night. Asked how Rocket Man is doing. Long gas lines forming in North Korea. Too bad!” Trump tweeted Sunday.

In terms of the Iran nuclear deal, Trump vowed to exit the agreement on the campaign trail, but has not hinted at any official moves to withdraw.

“You’ll be seeing very soon,” Trump told reporters Monday when asked whether he intended to tear up the deal.

The president has been critical of the Obama-era deal, amid concerns that Iran has failed to follow terms of the agreement. Trump has yet to make any official announcements of plans to pull out.

The move could be crucial to the relationship between the U.S. and Israel, as Israeli Prime Minister Benjamin Netanyahu has urged Trump to withdraw. The two leaders met privately at the U.N. on Monday, as Netanyahu expressed concerns about Iran’s “growing aggression in the region.” But the Israeli prime minister has touted Trump for actin with “clarity and conviction” in Israel.

Ahead of his meeting with Netanyahu, the president tweeted that “Peace in the Middle East would be a truly great legacy for ALL people!”

The Trump administration has also tried to broker a peace agreement between Israel and the Palestinians. Trump said Monday that he believes there is a “good chance” of success.

“The Trump administration would like to see it,” he said. “I think it can happen.””

The Associated Press contributed to this report.

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