As tensions continue to rise with North Korea,

the Trump administration says the United States

is ready to defend itself and its allies

with military action.

We've pretty much exhausted all the things

that we could do at the Security Council at this point.

JENNA BROWDER: U.S. Ambassador to the United Nations,

Nikki Haley, making it clear over the weekend

the U.S. isn't backing down from its threat of using

the military if necessary, saying

she'd be glad to hand over the situation

to the Secretary of Defense.

I'm perfectly happy kicking this over to General Mattis

because he has plenty of military options.

JENNA BROWDER: This comes as world leaders, including

President Trump, head to New York for the annual General

Assembly.

[ALARM]

On Friday, North Korea launched a missile over Japan

into the Pacific Ocean, defying new UN sanctions

banning some of its key exports and capping

its imports of crude oil.

It is a new day at the UN.

JENNA BROWDER: Asked about the president's statement

that the U.S. could respond to North Korea with quote fire

and fury, Haley says it was not an empty threat.

If North Korea keeps on with this reckless behavior,

if the United States has to defend itself or defend

its allies in any way, North Korea will be destroyed.

And we all know that.

And none of us want that.

None of us want war.

JENNA BROWDER: National Security Adviser H.R.

McMaster says it's time to stop kicking the can down the road

because the U.S. is running out of road.

This regime is so close now to threatening the United

States and others with a nuclear weapon

that we really have to move with a great deal of urgency

on sanctions, on diplomacy, and on preparing

if necessary a military option.

To add to the tension, there are now

reports North Korea is developing a nuclear submarine.

The "Washington Times" quotes a Japanese newspaper,

saying the vessel could be used to launch a ballistic missile

into international waters.

In Washington, Jenna Browder, CBN News.