President Trump called a national security team meeting to discuss the detonation, the White House said. In a series of tweets, Trump warned about North Korea becoming “very hostile” and “a great threat,” and he urged its neighboring nations, China and South Korea, to take action.

Asked by reporters if he planned to attack North Korea, Trump simply replied, “We’ll see.” Trump later announced in a tweet that he would be meeting with Defense Secretary James Mattis and other military leaders “to discuss North Korea.”

Meanwhile, Treasury Secretary Steven Mnuchin said he plans to draft an even stronger sanctions package against North Korea, just a month after the U.S. helped the United Nations pass a new series of sanctions.

Mnuchin said the new sanctions will ban any country from doing business with the United States if it also lends financial support to North Korea.

“There’s a lot we can do to cut them off economically, much more than we’ve done already,” Mnuchin said on “Fox News Sunday.”

Mnuchin would not rule out the possibility of Trump launching military action, and said Trump will “consider everything.”

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