Prime Minister Jacinda Ardern met with US President Donald Trump on Tuesday, but you wouldn't know it from watching a new video released on Trump's Twitter account.

The US President had a busy day at the United Nations ahead of the general assembly later this week, including chairing a meeting on protecting religious freedom and meeting with several heads of state.

Trump met with six leaders on Tuesday, with the White House referring to five of them as "bilateral meetings" but the meeting with Ardern as simply a "pull-aside".

He's now released a video on his Twitter account showing off what he has been doing, including footage from his meetings with the Prime Minister of Pakistan, and the presidents of Poland, Singapore, Egypt and Korea. 

But the video - featuring powerful orchestral music and which has been viewed more than 100,000 times within 15 minutes -  doesn't include Ardern.

The White House Twitter account has also shared multiple videos and photos of Trump at the United Nations, but nothing yet including New Zealand's Prime Minister.

The meeting was closed to press, with only two official photographers allowed in. Photos of the meeting show the pair in dialogue as well as Trump giving a big thumbs up.

Ardern said the level of media presence was something decided by the United States.

United States Ambassador to New Zealand Scott Brown earlier told The AM Show that the meeting was being taken very seriously and how it was described shouldn't matter. 

"These meetings, not everyone has a meeting, to say it is in a room with a couple of chairs is just a mischaracterisation," he said.

"I went back to DC to make sure everything was lined up for this meeting. It is a very important meeting. Both sides know exactly what they want to talk about."

Acting Prime Minister Winston Peters also said focus should be on what issues are raised in the meeting, rather than how it is described. 

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"She has time to make a serious impression upon him on the things that concern us, the greater engagement of the United States in the Pacific, on issues to do with the rule of law, the free trade agreement we are aspiring to, the fair treatment of New Zealand's businesses," he told The AM Show.

Ardern said she and Trump had a wide-ranging discussion, with the US President interested in New Zealand's tourism, the gun buyback and the Christchurch mosque attacks.

"I would describe it as an excellent meeting," she said.

"[He views] New Zealand very warmly, views the relationship very warmly, and holds New Zealanders in very high regard."

In a statement following the meeting, Peters called it a diplomatic coup.

"Securing a 25-minute long meeting with the US President during the UN Leaders Week is an achievement in its own right given the pressure on the President's schedule."