Her comments came at an emergency session of the U.N. Security Council on Wednesday.
Four U.S. Green Berets were killed in the October 4 attack blamed on ISIS-affiliated militants.
The U.S. ambassador to the United Nations firmly told Russia, "Don't interfere in our elections."
The president says Iran is has "multiple violations of the agreement," but those around him don't seem to agree.
She is the third Trump official to be reprimanded for similar ethics breaches.
"The time for well-meaning, diplomatic words in this Council has passed," Nikki Haley told the U.N. Security Council.
The president's "Rocket Man" nickname for Kim Jong Un is Trump branding at its best, Haley says.
The president is set to address the United Nations General Assembly.
Experts believe that backing North Korea into a corner could have unintended consequences.
Trump's threat to cut trade with North Korea's trade partners could be bad for the U.S. economy, experts warn.
Asked about Trump's latest comments, Secretary of Defense Jim Mattis instead emphasized the importance of diplomatic efforts.
The president invited the global community to unite in condemnation of the country's latest missile test.
The U.S. ambassador to the U.N., Nikki Haley, said the "world is on notice" after North Korea's latest missile test.
The U.N. ambassador tweeted after North Korea's intercontinental ballistic missile test on Monday.
The U.S. ambassador to the United Nations and the Secretary of defense each credit the president's "pay a price" threat, but did not offer direct evidence.
Nikki Haley spoke out against same-sex marriage when she was governor of South Carolina.
Two United Nations experts, including an American, were killed in Congo in March, but a local inquiry has been criticised.
She said she believed the arrest was leader Kim Jong Un "trying to really show his strength to the people of North Korea."
The U.N. deputy secretary-general says she and U.N. Secretary-General Antonio Guterres are concerned over the new administration's attitude toward fighting global warming.