Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE reaffirmed the “ironclad” commitment the U.S. has to defend South Korea as negotiations to denuclearize the Korean Peninsula continue.

The Defense Department said in a statement that both the U.S. and South Korea also “pledged continued close coordination to implement United Nations Security Council Resolutions and to support diplomatic efforts to achieve complete, verifiable, and irreversible denuclearization.”

The renewed commitment comes on the same day that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE spoke with South Korean President Moon Jae-in.

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Trump said the time and location for the planned summit with North Korea is being set.

On Friday, Moon and North Korean leader Kim Jong Un committed themselves to working toward a denuclearized Korean Peninsula and pledged to officially end the Korean War.

The commitment marks a stark shift for North Korea, which in the past had been adamant that it would not give up its nuclear arsenal.