"After seeing our capabilities, I am more confident than ever that our options are not only effective but overwhelming", Trump said.
The Trump administration appears to be reaching its limit with North Korea.
North Korea yesterday fired an intermediate range ballistic missile over Japan and into the Pacific Ocean. And there's little sign that talks involving the U.S., North Korea and other interested countries can be arranged amid the nearly weekly barrage of weapons tests and threats, let alone stop the North's determined nuclear march.
Earlier this week, the UN Security Council agreed to tighten sanctions on North Korea, banning its textile exports and capping fuel supplies.
"At that point, you know, there's not a whole lot the Security Council is going to be able to do", Ambassador Nikki Haley said, claiming global sanctions already have cut off 90 percent of North Korea's trade and 30 percent of its oil. Afterward, in a statement, the council condemned the "highly provocative launch" and called on North Korea to reduce tensions on the peninsula. She expected a Trump call for maximum pressure on North Korea.
South Korean President Moon Jae-in also convened a National Security Council meeting to monitor the situation and prepare for any emerging threats from North Korea.
Finally, on Thursday the President will meet with the leaders of Turkey, Afghanistan, and Ukraine, before South Korea and Japan, with which he will discuss the world's "most urgent and unsafe security problem", North Korea.
In August, North Korea launched a ballistic missile over Japan from a region near Pyongyang.
Responding to a question, Mattis said he is not aware of any effort on the part of South Korea to shoot down the North Korean missile.
"We call on all nations to take new measures against the Kim [Jong Un] regime", the top USA diplomat said.
Still, a reporter noted North Korea's behavior isn't really changing. "China and Russian Federation must indicate their intolerance for these reckless missile launches by taking direct actions of their own", Tillerson said.
A North Korean state agency threatened Thursday to use nuclear weapons to "sink" Japan and reduce the United States to "ashes and darkness" for supporting a U.N. Security Council resolution and sanctions over the latest nuclear test.
In a unanimous statement backed by China, the council said the launch was carried out just three weeks after a first missile overflew Japan and less than two weeks after Pyongyang´s sixth and biggest nuclear test.
Diplomacy on the North Korean nuclear standoff has been stalled for years.
Trump heads to the U.N. General Assembly meeting next week with the same suitcase of bad options as his predecessors. Washington has tried to work with Beijing to restrain the latter's ally in Pyongyang through economic sanctions. While Washington warns of military options, it says it still wants a peaceful solution.