United Nations Ambassador Nikki Haley, R-S.C., called for "a new approach" to dealing with North Korea because dictator Kim Jong-un "has not budged in anything."
"We are taking North Korea very seriously," the former South Carolina governor told Erin Burnett on CNN on Thursday.
She noted Pyongyang has completed 24 ballistic-missile tests in the last year – along with two tests of nuclear missiles – as well as the "assassination" of Kim's half-brother.
"You have to call into question what will work and what can't," she said.
Secretary of State Rex Tillerson called on North Korea to abandon its missile tests, describing the weapons programs as "dangerous and unlawful" Thursday.
He added 20 years of diplomatic and other efforts to get Pyongyang to denuclearize have failed.
However, Tillerson did not specify how the Trump administration would address North Korea.
Haley told Burnett that Tillerson was building support with other allies before pressuring China to act on North Korea.
"What you're seeing Secretary Tillerson do is going and talking to South Korea and let them know that we have their back, then talking to Japan and let them know that we need to work together, and continue to be the allies that we've been," Haley said.
"Then go to China and say, 'OK, what more do they need to do for you to consider them a threat?'
"This is number one priority for the United States — and we're going to do something about it."
Haley also declined to be more specific, only telling Burnett "all options are on the table."
She also noted, while she and President Donald Trump differed on Russia, "he has not in any way told me what not to say to them or in any way said that you need to work with Russia.
"The way we look at Russia, the way we look at every other country.
"If we see something that's wrong, like their involvement with Crimea and Ukraine, or we see something like them supporting and not fighting the chemical-weapons situations in Syria, we're going to call them out on it," Haley said.
"But if we see where we can work with them on issues like ISIS, we absolutely are going to do that.
"It's not about 'are they a friend or a foe,'" she continued. "It's how can we find them to be a friend when we need them — and when they're a foe, we'll stay true to American values and call them out on it."
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