Sen. Joni Ernst Joni Kay ErnstThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Romney backs pre-election Supreme Court vote, paving way for McConnell, Trump MORE (R-Iowa), a member of the Senate Armed Services committee, broke with President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Sunday over North Korean missile tests.

Speaking on CNN’s “State of the Union,” Ernst said she finds recent missile tests from the regime “very disturbing” and warned that she wouldn’t trust North Korean leader Kim Jong Un Kim Jong UnSatellite images indicate North Korea preparing for massive military parade South Korea warns of underwater missile test launch by North Korea Trump says he didn't share classified information following Woodward book MORE.

“I find them very disturbing, and certainly wouldn’t trust Kim Jong Un,” Ernst said. “I think we need to keep our eyes on North Korea, I understand the president wants to maintain a relationship … so that we can work with them. However, those strikes are disturbing.”

Sen. Joni Ernst on the recent North Korea missile test following President Trump’s tweet downplaying the action: “Those strikes are disturbing … We can’t continue to let them further develop any type of weapons system” #CNNSOTU pic.twitter.com/A5CBqJKKtQ — CNN Politics (@CNNPolitics) May 26, 2019

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The comments come in response to a Saturday tweet from Trump in which the president dismissed concerns about missile tests and said he has confidence in Kim.

"North Korea fired off some small weapons, which disturbed some of my people, and others, but not me," he tweeted. "I have confidence that Chairman Kim will keep his promise to me."

When asked whether she found Trump’s comments, made while in Japan for a diplomatic visit, disturbing, Ernst on Sunday replied: “Certainly.”

“I think Japan does have reason to be concerned, and I am concerned as well,” the senator said. “We need to see north Korea back off of those activities, and we need to take a very strong stance on that.

Ernst added that she understands Trump “has a job to do on negotiating,” but urged for a stronger “pushback” on North Korea to ensure that the regime is following United Nations guidelines prohibiting it from firing ballistic missiles.

“We can’t continue to let them further develop any type of weapons systems,” she said.

Trump has touted his friendly relationship with Kim as a step toward denuclearization on the Korean peninsula, but after two in-person summits, the two leaders have failed to reach a deal on nuclear negotiations and sanctions.