This undated picture released by North Korea's official Korean Central News Agency (KCNA) on September 3, 2017 shows North Korean leader Kim Jong Un, center, looking at a metal casing with two bulges at an undisclosed location.
Trump vows to keep pressure on North Korea
01:47 - Source: CNN

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Mattis said the US has military options that would not put Seoul at risk

Members of the administration have repeatedly emphasized that a range of military options are on the table