But the president stood before world leaders and a global audience and declared that U.N. members, acting as a collection of self-interested nations, should unite to confront global dangers.
This was the first meeting between Mr Tillerson and Iranian Foreign Minister Javad Zarif.
Yesterday, Mr Trump labelled the Joint Comprehensive Plan of Action, the Iranian nuclear deal, as an "embarrassment", hinting that he may withdraw the U.S. from the deal next month. He called it "an embarrassment to the United States" and "the worst and most one-sided transactions the United State has ever entered into".
Abandoning it further destabilizes the region and will narrow our path for any diplomatic solutions with North Korea as the regime will not sign any security agreement with the United States. He said of the president's address: "In over 30 years in my experience with the United Nations, I never heard a bolder or more courageous speech".
President Trump told reporters Wednesday at the United Nations General Assembly in NY that he has "decided" on what he will do about the Iran nuclear deal, although he isn't saying yet what that decision is.
Trump must decide by October 15 whether to certify that Iran is complying with the pact, a decision that could sink the deal. What I would say to that, though, is why would we blow up this nuclear deal now over something we're concerned about happening 10 years from now?
Seated alongside South Korean President Moon Jae-in and Japanese Prime Minister Shinzo Abe, Trump appeared open to talks with Kim, asking "why not" when asked by a reporter whether dialogue was still possible with Pyongyang.
Dhoni's suggestion for the hat-trick bowl helped me, says Kudeep Yadav
In the four matches that they have played together for India - 3 ODIs and 1 T20I - they have taken a combined tally of 17 wickets. Steve Smith, who has never shied away from using the feet, has been playing mostly from the crease or off the back foot.
A US official said the White House accommodated as many requests for meetings as they could schedule, noting some leaders who wanted to meet Trump did not make the cut.
European Union foreign policy chief Federica Mogherini, who hosted the meeting, said all parties to the accord including Tillerson agreed it "is working and is delivering for its goal". "Just like you, the leaders of your countries, should and always put your countries first", said Trump, who assured the U.N. that the United States would not abdicate its leadership position in the world but needed other countries to contribute more.
The remarks followed a day in which country after country reaffirmed its support for the nuclear deal before the U.N. General Assembly. By the time Trump departed late Thursday for his golf resort in New Jersey, the leaders of both North Korea and Iran had thumbed their noses at Trump's bombast, responding with their own insults. For the 2015-16 academic year, she was a U.S. Fulbright Fellow in Greece covering Europe's refugee crisis.
"I think the challenge for President Trump is to avoid saying things that causes him to be seen as part of the problem", said Gary Samore, a top Obama administration nuclear adviser.
If Congress decides to reimpose economic sanctions - despite opposition from fellow deal signatories Britain, China, France, Germany and Russian Federation - the agreement would likely collapse.
Trump's less than diplomatic speech on Tuesday recalled the fiery nationalist language of his January 20 inaugural address and raised eyebrows across the political spectrum by its bald assertion of the primacy of US interests.