President Trump told reporters Tuesday at the White House that the package of sanctions the United Nations passed a day earlier against North Korea is "not a big deal."

"We think it's just another very small step – not a big deal. Rex [Tillerson] and I were just discussing not knowing if it has any impact, but it's nice to get a 15-to-nothing vote. Those sanctions are nothing compared to ultimately what will have to happen," Trump said.

A day earlier, U.S. ambassador to the UN Nikki Haley called the sanctions the "strongest measures ever imposed."

"This will cut deep," Haley said. "They give us a much better chance to halt the regime's ability to fuel and finance its nuclear and missile programs."

Defense Secretary James Mattis on Tuesday said the choice is up to Kim.

"These are the most severe sanctions yet laid on North Korea and we'll see what choices the North Koreans make," Mattis said.

The new sanctions target North Korea's oil and textile imports and are expected to shave off $1.3 billion annually from the nation's profits. The latest round of sanctions is in response to Kim Jong Un's administration continually testing missiles, but the sanctions were watered down from the original U.S. proposal in order to ensure support from China and Russia.